api,introspection: 'SupportedModes' is now a list of possible combinations

Instead of just a mask of MMModemMode values, we now provide a list of the
allowed and preferred mode combinations supported by the modem. E.g.:

$> sudo mmcli -m 0
  -------------------------
  Modes    |      supported: 'allowed: 2g; preferred: none
           |                  allowed: 3g; preferred: none
           |                  allowed: 2g, 3g; preferred: none
           |                  allowed: 2g, 3g; preferred: 2g
           |                  allowed: 2g, 3g; preferred: 3g
           |                  allowed: 4g; preferred: none
           |                  allowed: 2g, 3g, 4g; preferred: none'

15 files changed, 1198 insertions, 131 deletions

diff --git a/plugins/cinterion/mm-broadband-modem-cinterion.c b/plugins/cinterion/mm-broadband-modem-cinterion.c
index 921755ba..4c74774c 100644
--- a/plugins/cinterion/mm-broadband-modem-cinterion.c
+++ b/plugins/cinterion/mm-broadband-modem-cinterion.c
@@ -38,10 +38,12 @@ static void iface_modem_init      (MMIfaceModem *iface);
 static void iface_modem_3gpp_init (MMIfaceModem3gpp *iface);
 static void iface_modem_messaging_init (MMIfaceModemMessaging *iface);
 
+static MMIfaceModem *iface_modem_parent;
+
 G_DEFINE_TYPE_EXTENDED (MMBroadbandModemCinterion, mm_broadband_modem_cinterion, MM_TYPE_BROADBAND_MODEM, 0,
                         G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM, iface_modem_init)
                         G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM_3GPP, iface_modem_3gpp_init)
-                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM_MESSAGING, iface_modem_messaging_init));
+                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM_MESSAGING, iface_modem_messaging_init))
 
 struct _MMBroadbandModemCinterionPrivate {
     /* Flag to know if we should try AT^SIND or not to get psinfo */
@@ -514,6 +516,80 @@ load_access_technologies (MMIfaceModem *self,
 }
 
 /*****************************************************************************/
+/* Load supported modes (Modem interface) */
+
+static GArray *
+load_supported_modes_finish (MMIfaceModem *self,
+                             GAsyncResult *res,
+                             GError **error)
+{
+    if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (res), error))
+        return NULL;
+
+    return g_array_ref (g_simple_async_result_get_op_res_gpointer (G_SIMPLE_ASYNC_RESULT (res)));
+}
+
+static void
+parent_load_supported_modes_ready (MMIfaceModem *self,
+                                   GAsyncResult *res,
+                                   GSimpleAsyncResult *simple)
+{
+    GError *error = NULL;
+    GArray *all;
+    GArray *combinations;
+    GArray *filtered;
+    MMModemModeCombination mode;
+
+    all = iface_modem_parent->load_supported_modes_finish (self, res, &error);
+    if (!all) {
+        g_simple_async_result_take_error (simple, error);
+        g_simple_async_result_complete (simple);
+        g_object_unref (simple);
+        return;
+    }
+
+    /* Build list of combinations */
+    combinations = g_array_sized_new (FALSE, FALSE, sizeof (MMModemModeCombination), 3);
+
+    /* 2G only */
+    mode.allowed = MM_MODEM_MODE_2G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 3G only */
+    mode.allowed = MM_MODEM_MODE_3G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+
+    /* Filter out those unsupported modes */
+    filtered = mm_filter_supported_modes (all, combinations);
+    g_array_unref (all);
+    g_array_unref (combinations);
+
+    g_simple_async_result_set_op_res_gpointer (simple, filtered, (GDestroyNotify) g_array_unref);
+    g_simple_async_result_complete (simple);
+    g_object_unref (simple);
+}
+
+static void
+load_supported_modes (MMIfaceModem *self,
+                      GAsyncReadyCallback callback,
+                      gpointer user_data)
+{
+    /* Run parent's loading */
+    iface_modem_parent->load_supported_modes (
+        MM_IFACE_MODEM (self),
+        (GAsyncReadyCallback)parent_load_supported_modes_ready,
+        g_simple_async_result_new (G_OBJECT (self),
+                                   callback,
+                                   user_data,
+                                   load_supported_modes));
+}
+
+/*****************************************************************************/
 /* ALLOWED MODES */
 
 static gboolean
@@ -1191,6 +1267,10 @@ finalize (GObject *object)
 static void
 iface_modem_init (MMIfaceModem *iface)
 {
+    iface_modem_parent = g_type_interface_peek_parent (iface);
+
+    iface->load_supported_modes = load_supported_modes;
+    iface->load_supported_modes_finish = load_supported_modes_finish;
     iface->set_allowed_modes = set_allowed_modes;
     iface->set_allowed_modes_finish = set_allowed_modes_finish;
     iface->load_supported_bands = load_supported_bands;
diff --git a/plugins/huawei/mm-broadband-modem-huawei.c b/plugins/huawei/mm-broadband-modem-huawei.c
index 19965b47..410032df 100644
--- a/plugins/huawei/mm-broadband-modem-huawei.c
+++ b/plugins/huawei/mm-broadband-modem-huawei.c
@@ -1075,6 +1075,90 @@ set_current_bands (MMIfaceModem *self,
 }
 
 /*****************************************************************************/
+/* Load supported modes (Modem interface) */
+
+static GArray *
+load_supported_modes_finish (MMIfaceModem *self,
+                             GAsyncResult *res,
+                             GError **error)
+{
+    if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (res), error))
+        return NULL;
+
+    return g_array_ref (g_simple_async_result_get_op_res_gpointer (G_SIMPLE_ASYNC_RESULT (res)));
+}
+
+static void
+parent_load_supported_modes_ready (MMIfaceModem *self,
+                                   GAsyncResult *res,
+                                   GSimpleAsyncResult *simple)
+{
+    GError *error = NULL;
+    GArray *all;
+    GArray *combinations;
+    GArray *filtered;
+    MMModemModeCombination mode;
+
+    all = iface_modem_parent->load_supported_modes_finish (self, res, &error);
+    if (!all) {
+        g_simple_async_result_take_error (simple, error);
+        g_simple_async_result_complete (simple);
+        g_object_unref (simple);
+        return;
+    }
+
+    /* Build list of combinations */
+    combinations = g_array_sized_new (FALSE, FALSE, sizeof (MMModemModeCombination), 5);
+    /* 2G only */
+    mode.allowed = MM_MODEM_MODE_2G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 3G only */
+    mode.allowed = MM_MODEM_MODE_3G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* CDMA modems don't support 'preferred' setups */
+    if (!mm_iface_modem_is_cdma_only (self)) {
+        /* 2G and 3G, 2G preferred */
+        mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+        mode.preferred = MM_MODEM_MODE_2G;
+        g_array_append_val (combinations, mode);
+        /* 2G and 3G, 3G preferred */
+        mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+        mode.preferred = MM_MODEM_MODE_3G;
+        g_array_append_val (combinations, mode);
+    }
+
+    /* Filter out those unsupported modes */
+    filtered = mm_filter_supported_modes (all, combinations);
+    g_array_unref (all);
+    g_array_unref (combinations);
+
+    g_simple_async_result_set_op_res_gpointer (simple, filtered, (GDestroyNotify) g_array_unref);
+    g_simple_async_result_complete (simple);
+    g_object_unref (simple);
+}
+
+static void
+load_supported_modes (MMIfaceModem *self,
+                      GAsyncReadyCallback callback,
+                      gpointer user_data)
+{
+    /* Run parent's loading */
+    iface_modem_parent->load_supported_modes (
+        MM_IFACE_MODEM (self),
+        (GAsyncReadyCallback)parent_load_supported_modes_ready,
+        g_simple_async_result_new (G_OBJECT (self),
+                                   callback,
+                                   user_data,
+                                   load_supported_modes));
+}
+
+/*****************************************************************************/
 /* Load initial allowed/preferred modes (Modem interface) */
 
 static gboolean
@@ -1091,7 +1175,7 @@ parse_prefmode (const gchar *response, MMModemMode *preferred, GError **error)
         *preferred = MM_MODEM_MODE_3G;
         return TRUE;
     } else if (a == 8) {
-        *preferred = MM_MODEM_MODE_2G | MM_MODEM_MODE_3G;
+        *preferred = MM_MODEM_MODE_NONE;
         return TRUE;
     }
 
@@ -1116,10 +1200,7 @@ load_allowed_modes_finish (MMIfaceModem *self,
         return FALSE;
 
     if (mm_iface_modem_is_cdma_only (self)) {
-        /* CDMA-only devices always support 2G and 3G if they have 3G, so just
-         * use the modes from GCAP as the list of allowed modes.
-         */
-        *allowed = mm_iface_modem_get_supported_modes (self);
+        *allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
         return parse_prefmode (response, preferred, error);
     }
 
@@ -2660,6 +2741,8 @@ iface_modem_init (MMIfaceModem *iface)
     iface->load_current_bands_finish = load_current_bands_finish;
     iface->set_current_bands = set_current_bands;
     iface->set_current_bands_finish = set_current_bands_finish;
+    iface->load_supported_modes = load_supported_modes;
+    iface->load_supported_modes_finish = load_supported_modes_finish;
     iface->load_allowed_modes = load_allowed_modes;
     iface->load_allowed_modes_finish = load_allowed_modes_finish;
     iface->set_allowed_modes = set_allowed_modes;
diff --git a/plugins/icera/mm-broadband-modem-icera.c b/plugins/icera/mm-broadband-modem-icera.c
index 7d8661bc..a9fdfe38 100644
--- a/plugins/icera/mm-broadband-modem-icera.c
+++ b/plugins/icera/mm-broadband-modem-icera.c
@@ -40,12 +40,13 @@ static void iface_modem_init (MMIfaceModem *iface);
 static void iface_modem_3gpp_init (MMIfaceModem3gpp *iface);
 static void iface_modem_time_init (MMIfaceModemTime *iface);
 
+static MMIfaceModem *iface_modem_parent;
 static MMIfaceModem3gpp *iface_modem_3gpp_parent;
 
 G_DEFINE_TYPE_EXTENDED (MMBroadbandModemIcera, mm_broadband_modem_icera, MM_TYPE_BROADBAND_MODEM, 0,
                         G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM, iface_modem_init)
                         G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM_3GPP, iface_modem_3gpp_init)
-                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM_TIME, iface_modem_time_init));
+                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM_TIME, iface_modem_time_init))
 
 enum {
     PROP_0,
@@ -67,6 +68,88 @@ struct _MMBroadbandModemIceraPrivate {
 };
 
 /*****************************************************************************/
+/* Load supported modes (Modem interface) */
+
+static GArray *
+load_supported_modes_finish (MMIfaceModem *self,
+                             GAsyncResult *res,
+                             GError **error)
+{
+    if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (res), error))
+        return NULL;
+
+    return g_array_ref (g_simple_async_result_get_op_res_gpointer (G_SIMPLE_ASYNC_RESULT (res)));
+}
+
+static void
+parent_load_supported_modes_ready (MMIfaceModem *self,
+                                   GAsyncResult *res,
+                                   GSimpleAsyncResult *simple)
+{
+    GError *error = NULL;
+    GArray *all;
+    GArray *combinations;
+    GArray *filtered;
+    MMModemModeCombination mode;
+
+    all = iface_modem_parent->load_supported_modes_finish (self, res, &error);
+    if (!all) {
+        g_simple_async_result_take_error (simple, error);
+        g_simple_async_result_complete (simple);
+        g_object_unref (simple);
+        return;
+    }
+
+    /* Build list of combinations */
+    combinations = g_array_sized_new (FALSE, FALSE, sizeof (MMModemModeCombination), 5);
+
+    /* 2G only */
+    mode.allowed = MM_MODEM_MODE_2G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 3G only */
+    mode.allowed = MM_MODEM_MODE_3G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G, 2G preferred */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_2G;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G, 3G preferred */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_3G;
+    g_array_append_val (combinations, mode);
+
+    /* Filter out those unsupported modes */
+    filtered = mm_filter_supported_modes (all, combinations);
+    g_array_unref (all);
+    g_array_unref (combinations);
+
+    g_simple_async_result_set_op_res_gpointer (simple, filtered, (GDestroyNotify) g_array_unref);
+    g_simple_async_result_complete (simple);
+    g_object_unref (simple);
+}
+
+static void
+load_supported_modes (MMIfaceModem *self,
+                      GAsyncReadyCallback callback,
+                      gpointer user_data)
+{
+    /* Run parent's loading */
+    iface_modem_parent->load_supported_modes (
+        MM_IFACE_MODEM (self),
+        (GAsyncReadyCallback)parent_load_supported_modes_ready,
+        g_simple_async_result_new (G_OBJECT (self),
+                                   callback,
+                                   user_data,
+                                   load_supported_modes));
+}
+
+/*****************************************************************************/
 /* Load initial allowed/preferred modes (Modem interface) */
 
 static gboolean
@@ -201,7 +284,8 @@ modem_set_allowed_modes (MMIfaceModem *self,
             icera_mode = 3;
         else /* none preferred, so AUTO */
             icera_mode = 5;
-    }
+    } else if (allowed == MM_MODEM_MODE_ANY && preferred == MM_MODEM_MODE_NONE)
+        icera_mode = 5;
 
     if (icera_mode < 0) {
         gchar *allowed_str;
@@ -1769,6 +1853,10 @@ finalize (GObject *object)
 static void
 iface_modem_init (MMIfaceModem *iface)
 {
+    iface_modem_parent = g_type_interface_peek_parent (iface);
+
+    iface->load_supported_modes = load_supported_modes;
+    iface->load_supported_modes_finish = load_supported_modes_finish;
     iface->load_allowed_modes = modem_load_allowed_modes;
     iface->load_allowed_modes_finish = modem_load_allowed_modes_finish;
     iface->set_allowed_modes = modem_set_allowed_modes;
diff --git a/plugins/iridium/mm-broadband-modem-iridium.c b/plugins/iridium/mm-broadband-modem-iridium.c
index c3c81aaf..b26851b2 100644
--- a/plugins/iridium/mm-broadband-modem-iridium.c
+++ b/plugins/iridium/mm-broadband-modem-iridium.c
@@ -219,13 +219,12 @@ setup_flow_control (MMIfaceModem *self,
 /*****************************************************************************/
 /* Load supported modes (Modem inteface) */
 
-static MMModemMode
+static GArray *
 load_supported_modes_finish (MMIfaceModem *self,
                              GAsyncResult *res,
                              GError **error)
 {
-    /* Report CS only, Iridium connections are circuit-switched */
-    return MM_MODEM_MODE_CS;
+    return g_array_ref (g_simple_async_result_get_op_res_gpointer (G_SIMPLE_ASYNC_RESULT (res)));
 }
 
 static void
@@ -234,11 +233,23 @@ load_supported_modes (MMIfaceModem *self,
                       gpointer user_data)
 {
     GSimpleAsyncResult *result;
+    GArray *combinations;
+    MMModemModeCombination mode;
 
     result = g_simple_async_result_new (G_OBJECT (self),
                                         callback,
                                         user_data,
                                         load_supported_modes);
+
+    /* Build list of combinations */
+    combinations = g_array_sized_new (FALSE, FALSE, sizeof (MMModemModeCombination), 1);
+
+    /* Report CS only, Iridium connections are circuit-switched */
+    mode.allowed = MM_MODEM_MODE_CS;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+
+    g_simple_async_result_set_op_res_gpointer (result, combinations, (GDestroyNotify) g_array_unref);
     g_simple_async_result_complete_in_idle (result);
     g_object_unref (result);
 }
diff --git a/plugins/linktop/mm-broadband-modem-linktop.c b/plugins/linktop/mm-broadband-modem-linktop.c
index 49722819..bcfa7daf 100644
--- a/plugins/linktop/mm-broadband-modem-linktop.c
+++ b/plugins/linktop/mm-broadband-modem-linktop.c
@@ -40,8 +40,84 @@
 
 static void iface_modem_init (MMIfaceModem *iface);
 
+static MMIfaceModem *iface_modem_parent;
+
 G_DEFINE_TYPE_EXTENDED (MMBroadbandModemLinktop, mm_broadband_modem_linktop, MM_TYPE_BROADBAND_MODEM, 0,
-                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM, iface_modem_init));
+                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM, iface_modem_init))
+
+/*****************************************************************************/
+/* Load supported modes (Modem interface) */
+
+static GArray *
+load_supported_modes_finish (MMIfaceModem *self,
+                             GAsyncResult *res,
+                             GError **error)
+{
+    if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (res), error))
+        return NULL;
+
+    return g_array_ref (g_simple_async_result_get_op_res_gpointer (G_SIMPLE_ASYNC_RESULT (res)));
+}
+
+static void
+parent_load_supported_modes_ready (MMIfaceModem *self,
+                                   GAsyncResult *res,
+                                   GSimpleAsyncResult *simple)
+{
+    GError *error = NULL;
+    GArray *all;
+    GArray *combinations;
+    GArray *filtered;
+    MMModemModeCombination mode;
+
+    all = iface_modem_parent->load_supported_modes_finish (self, res, &error);
+    if (!all) {
+        g_simple_async_result_take_error (simple, error);
+        g_simple_async_result_complete (simple);
+        g_object_unref (simple);
+        return;
+    }
+
+    /* Build list of combinations */
+    combinations = g_array_sized_new (FALSE, FALSE, sizeof (MMModemModeCombination), 3);
+
+    /* 2G only */
+    mode.allowed = MM_MODEM_MODE_2G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 3G only */
+    mode.allowed = MM_MODEM_MODE_3G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+
+    /* Filter out those unsupported modes */
+    filtered = mm_filter_supported_modes (all, combinations);
+    g_array_unref (all);
+    g_array_unref (combinations);
+
+    g_simple_async_result_set_op_res_gpointer (simple, filtered, (GDestroyNotify) g_array_unref);
+    g_simple_async_result_complete (simple);
+    g_object_unref (simple);
+}
+
+static void
+load_supported_modes (MMIfaceModem *self,
+                      GAsyncReadyCallback callback,
+                      gpointer user_data)
+{
+    /* Run parent's loading */
+    iface_modem_parent->load_supported_modes (
+        MM_IFACE_MODEM (self),
+        (GAsyncReadyCallback)parent_load_supported_modes_ready,
+        g_simple_async_result_new (G_OBJECT (self),
+                                   callback,
+                                   user_data,
+                                   load_supported_modes));
+}
 
 /*****************************************************************************/
 /* Load initial allowed/preferred modes (Modem interface) */
@@ -158,9 +234,11 @@ set_allowed_modes (MMIfaceModem *self,
     else if (allowed == MM_MODEM_MODE_3G)
         linktop_mode = LINKTOP_MODE_3G;
     else if ((allowed == (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G)) &&
-             (preferred == MM_MODEM_MODE_NONE)) {
+             (preferred == MM_MODEM_MODE_NONE))
+        linktop_mode = LINKTOP_MODE_ANY;
+    else if ((allowed == MM_MODEM_MODE_ANY &&
+              preferred == MM_MODEM_MODE_NONE))
         linktop_mode = LINKTOP_MODE_ANY;
-    }
 
     if (linktop_mode < 0) {
         gchar *allowed_str;
@@ -220,6 +298,10 @@ mm_broadband_modem_linktop_init (MMBroadbandModemLinktop *self)
 static void
 iface_modem_init (MMIfaceModem *iface)
 {
+    iface_modem_parent = g_type_interface_peek_parent (iface);
+
+    iface->load_supported_modes = load_supported_modes;
+    iface->load_supported_modes_finish = load_supported_modes_finish;
     iface->load_allowed_modes = load_allowed_modes;
     iface->load_allowed_modes_finish = load_allowed_modes_finish;
     iface->set_allowed_modes = set_allowed_modes;
diff --git a/plugins/longcheer/mm-broadband-modem-longcheer.c b/plugins/longcheer/mm-broadband-modem-longcheer.c
index 949d54d8..3abaaeaf 100644
--- a/plugins/longcheer/mm-broadband-modem-longcheer.c
+++ b/plugins/longcheer/mm-broadband-modem-longcheer.c
@@ -33,8 +33,88 @@
 
 static void iface_modem_init (MMIfaceModem *iface);
 
+static MMIfaceModem *iface_modem_parent;
+
 G_DEFINE_TYPE_EXTENDED (MMBroadbandModemLongcheer, mm_broadband_modem_longcheer, MM_TYPE_BROADBAND_MODEM, 0,
-                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM, iface_modem_init));
+                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM, iface_modem_init))
+
+/*****************************************************************************/
+/* Load supported modes (Modem interface) */
+
+static GArray *
+load_supported_modes_finish (MMIfaceModem *self,
+                             GAsyncResult *res,
+                             GError **error)
+{
+    if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (res), error))
+        return NULL;
+
+    return g_array_ref (g_simple_async_result_get_op_res_gpointer (G_SIMPLE_ASYNC_RESULT (res)));
+}
+
+static void
+parent_load_supported_modes_ready (MMIfaceModem *self,
+                                   GAsyncResult *res,
+                                   GSimpleAsyncResult *simple)
+{
+    GError *error = NULL;
+    GArray *all;
+    GArray *combinations;
+    GArray *filtered;
+    MMModemModeCombination mode;
+
+    all = iface_modem_parent->load_supported_modes_finish (self, res, &error);
+    if (!all) {
+        g_simple_async_result_take_error (simple, error);
+        g_simple_async_result_complete (simple);
+        g_object_unref (simple);
+        return;
+    }
+
+    /* Build list of combinations */
+    combinations = g_array_sized_new (FALSE, FALSE, sizeof (MMModemModeCombination), 4);
+
+    /* 2G only */
+    mode.allowed = MM_MODEM_MODE_2G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 3G only */
+    mode.allowed = MM_MODEM_MODE_3G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G, 2G preferred */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_2G;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G, 3G preferred */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_3G;
+    g_array_append_val (combinations, mode);
+
+    /* Filter out those unsupported modes */
+    filtered = mm_filter_supported_modes (all, combinations);
+    g_array_unref (all);
+    g_array_unref (combinations);
+
+    g_simple_async_result_set_op_res_gpointer (simple, filtered, (GDestroyNotify) g_array_unref);
+    g_simple_async_result_complete (simple);
+    g_object_unref (simple);
+}
+
+static void
+load_supported_modes (MMIfaceModem *self,
+                      GAsyncReadyCallback callback,
+                      gpointer user_data)
+{
+    /* Run parent's loading */
+    iface_modem_parent->load_supported_modes (
+        MM_IFACE_MODEM (self),
+        (GAsyncReadyCallback)parent_load_supported_modes_ready,
+        g_simple_async_result_new (G_OBJECT (self),
+                                   callback,
+                                   user_data,
+                                   load_supported_modes));
+}
 
 /*****************************************************************************/
 /* Load initial allowed/preferred modes (Modem interface) */
@@ -76,16 +156,16 @@ load_allowed_modes_finish (MMIfaceModem *self,
         *allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
         *preferred = MM_MODEM_MODE_3G;
         return TRUE;
-    case 4:
-        /* GSM preferred */
-        *allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
-        *preferred = MM_MODEM_MODE_2G;
-        return TRUE;
     case 3:
         /* GSM only */
         *allowed = MM_MODEM_MODE_2G;
         *preferred = MM_MODEM_MODE_NONE;
         return TRUE;
+    case 4:
+        /* GSM preferred */
+        *allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+        *preferred = MM_MODEM_MODE_2G;
+        return TRUE;
     default:
         break;
     }
@@ -159,14 +239,14 @@ set_allowed_modes (MMIfaceModem *self,
         mododr = 3;
     else if (allowed == MM_MODEM_MODE_3G)
         mododr = 1;
-    else if (allowed == MM_MODEM_MODE_ANY || (allowed == (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G))) {
+    else if (allowed == (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G)) {
         if (preferred == MM_MODEM_MODE_2G)
             mododr = 4;
-        else if (preferred == MM_MODEM_MODE_3G ||
-                 preferred == MM_MODEM_MODE_NONE ||
-                 preferred == MM_MODEM_MODE_ANY)
+        else if (preferred == MM_MODEM_MODE_3G)
             mododr = 2;
-    }
+    } else if (allowed == MM_MODEM_MODE_ANY && preferred == MM_MODEM_MODE_NONE)
+        /* Default to 3G preferred */
+        mododr = 2;
 
     if (mododr == 0) {
         gchar *allowed_str;
@@ -338,8 +418,12 @@ mm_broadband_modem_longcheer_init (MMBroadbandModemLongcheer *self)
 static void
 iface_modem_init (MMIfaceModem *iface)
 {
+    iface_modem_parent = g_type_interface_peek_parent (iface);
+
     iface->load_access_technologies = load_access_technologies;
     iface->load_access_technologies_finish = load_access_technologies_finish;
+    iface->load_supported_modes = load_supported_modes;
+    iface->load_supported_modes_finish = load_supported_modes_finish;
     iface->load_allowed_modes = load_allowed_modes;
     iface->load_allowed_modes_finish = load_allowed_modes_finish;
     iface->set_allowed_modes = set_allowed_modes;
diff --git a/plugins/mbm/mm-broadband-modem-mbm.c b/plugins/mbm/mm-broadband-modem-mbm.c
index f75a9a8d..e5eacaf0 100644
--- a/plugins/mbm/mm-broadband-modem-mbm.c
+++ b/plugins/mbm/mm-broadband-modem-mbm.c
@@ -45,6 +45,7 @@
 static void iface_modem_init (MMIfaceModem *iface);
 static void iface_modem_3gpp_init (MMIfaceModem3gpp *iface);
 
+static MMIfaceModem *iface_modem_parent;
 static MMIfaceModem3gpp *iface_modem_3gpp_parent;
 
 G_DEFINE_TYPE_EXTENDED (MMBroadbandModemMbm, mm_broadband_modem_mbm, MM_TYPE_BROADBAND_MODEM, 0,
@@ -191,6 +192,80 @@ modem_after_sim_unlock (MMIfaceModem *self,
 }
 
 /*****************************************************************************/
+/* Load supported modes (Modem interface) */
+
+static GArray *
+load_supported_modes_finish (MMIfaceModem *self,
+                             GAsyncResult *res,
+                             GError **error)
+{
+    if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (res), error))
+        return NULL;
+
+    return g_array_ref (g_simple_async_result_get_op_res_gpointer (G_SIMPLE_ASYNC_RESULT (res)));
+}
+
+static void
+parent_load_supported_modes_ready (MMIfaceModem *self,
+                                   GAsyncResult *res,
+                                   GSimpleAsyncResult *simple)
+{
+    GError *error = NULL;
+    GArray *all;
+    GArray *combinations;
+    GArray *filtered;
+    MMModemModeCombination mode;
+
+    all = iface_modem_parent->load_supported_modes_finish (self, res, &error);
+    if (!all) {
+        g_simple_async_result_take_error (simple, error);
+        g_simple_async_result_complete (simple);
+        g_object_unref (simple);
+        return;
+    }
+
+    /* Build list of combinations */
+    combinations = g_array_sized_new (FALSE, FALSE, sizeof (MMModemModeCombination), 3);
+
+    /* 2G only */
+    mode.allowed = MM_MODEM_MODE_2G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 3G only */
+    mode.allowed = MM_MODEM_MODE_3G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+
+    /* Filter out those unsupported modes */
+    filtered = mm_filter_supported_modes (all, combinations);
+    g_array_unref (all);
+    g_array_unref (combinations);
+
+    g_simple_async_result_set_op_res_gpointer (simple, filtered, (GDestroyNotify) g_array_unref);
+    g_simple_async_result_complete (simple);
+    g_object_unref (simple);
+}
+
+static void
+load_supported_modes (MMIfaceModem *self,
+                      GAsyncReadyCallback callback,
+                      gpointer user_data)
+{
+    /* Run parent's loading */
+    iface_modem_parent->load_supported_modes (
+        MM_IFACE_MODEM (self),
+        (GAsyncReadyCallback)parent_load_supported_modes_ready,
+        g_simple_async_result_new (G_OBJECT (self),
+                                   callback,
+                                   user_data,
+                                   load_supported_modes));
+}
+
+/*****************************************************************************/
 /* Load initial allowed/preferred modes (Modem interface) */
 
 static gboolean
@@ -1237,12 +1312,16 @@ finalize (GObject *object)
 static void
 iface_modem_init (MMIfaceModem *iface)
 {
+    iface_modem_parent = g_type_interface_peek_parent (iface);
+
     iface->create_bearer = modem_create_bearer;
     iface->create_bearer_finish = modem_create_bearer_finish;
     iface->create_sim = create_sim;
     iface->create_sim_finish = create_sim_finish;
     iface->modem_after_sim_unlock = modem_after_sim_unlock;
     iface->modem_after_sim_unlock_finish = modem_after_sim_unlock_finish;
+    iface->load_supported_modes = load_supported_modes;
+    iface->load_supported_modes_finish = load_supported_modes_finish;
     iface->load_allowed_modes = load_allowed_modes;
     iface->load_allowed_modes_finish = load_allowed_modes_finish;
     iface->set_allowed_modes = set_allowed_modes;
diff --git a/plugins/nokia/mm-broadband-modem-nokia.c b/plugins/nokia/mm-broadband-modem-nokia.c
index 998683c1..a0f870b8 100644
--- a/plugins/nokia/mm-broadband-modem-nokia.c
+++ b/plugins/nokia/mm-broadband-modem-nokia.c
@@ -68,45 +68,6 @@ create_sim (MMIfaceModem *self,
 }
 
 /*****************************************************************************/
-/* Load supported modes (Modem interface) */
-
-static MMModemMode
-modem_load_supported_modes_finish (MMIfaceModem *self,
-                                   GAsyncResult *res,
-                                   GError **error)
-{
-    return (MMModemMode)GPOINTER_TO_UINT (g_simple_async_result_get_op_res_gpointer (
-                                              G_SIMPLE_ASYNC_RESULT (res)));
-}
-
-static void
-modem_load_supported_modes (MMIfaceModem *self,
-                            GAsyncReadyCallback callback,
-                            gpointer user_data)
-{
-    GSimpleAsyncResult *result;
-    MMModemMode mode;
-
-    /* Nokia phones don't seem to like AT+WS46?, they just report 2G even if
-     * 3G is supported, so we'll just assume they actually do 3G. */
-    mode = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
-
-    /* Then, if the modem has LTE caps, it does 4G */
-    if (mm_iface_modem_is_3gpp_lte (MM_IFACE_MODEM (self)))
-            mode |= MM_MODEM_MODE_4G;
-
-    result = g_simple_async_result_new (G_OBJECT (self),
-                                        callback,
-                                        user_data,
-                                        modem_load_supported_modes);
-    g_simple_async_result_set_op_res_gpointer (result,
-                                               GUINT_TO_POINTER (mode),
-                                               NULL);
-    g_simple_async_result_complete_in_idle (result);
-    g_object_unref (result);
-}
-
-/*****************************************************************************/
 /* Load access technologies (Modem interface) */
 
 typedef struct {
@@ -407,8 +368,6 @@ iface_modem_init (MMIfaceModem *iface)
     iface->modem_power_down = NULL;
     iface->modem_power_down_finish = NULL;
 
-    iface->load_supported_modes = modem_load_supported_modes;
-    iface->load_supported_modes_finish = modem_load_supported_modes_finish;
     iface->load_access_technologies = load_access_technologies;
     iface->load_access_technologies_finish = load_access_technologies_finish;
 }
diff --git a/plugins/novatel/mm-broadband-modem-novatel.c b/plugins/novatel/mm-broadband-modem-novatel.c
index 3d84509b..62f4a3a7 100644
--- a/plugins/novatel/mm-broadband-modem-novatel.c
+++ b/plugins/novatel/mm-broadband-modem-novatel.c
@@ -48,7 +48,89 @@ G_DEFINE_TYPE_EXTENDED (MMBroadbandModemNovatel, mm_broadband_modem_novatel, MM_
                         G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM, iface_modem_init)
                         G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM_MESSAGING, iface_modem_messaging_init)
                         G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM_CDMA, iface_modem_cdma_init)
-                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM_TIME, iface_modem_time_init));
+                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM_TIME, iface_modem_time_init))
+
+/*****************************************************************************/
+/* Load supported modes (Modem interface) */
+
+static GArray *
+load_supported_modes_finish (MMIfaceModem *self,
+                             GAsyncResult *res,
+                             GError **error)
+{
+    if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (res), error))
+        return NULL;
+
+    return g_array_ref (g_simple_async_result_get_op_res_gpointer (G_SIMPLE_ASYNC_RESULT (res)));
+}
+
+static void
+parent_load_supported_modes_ready (MMIfaceModem *self,
+                                   GAsyncResult *res,
+                                   GSimpleAsyncResult *simple)
+{
+    GError *error = NULL;
+    GArray *all;
+    GArray *combinations;
+    GArray *filtered;
+    MMModemModeCombination mode;
+
+    all = iface_modem_parent->load_supported_modes_finish (self, res, &error);
+    if (!all) {
+        g_simple_async_result_take_error (simple, error);
+        g_simple_async_result_complete (simple);
+        g_object_unref (simple);
+        return;
+    }
+
+    /* Build list of combinations */
+    combinations = g_array_sized_new (FALSE, FALSE, sizeof (MMModemModeCombination), 5);
+
+    /* 2G only */
+    mode.allowed = MM_MODEM_MODE_2G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 3G only */
+    mode.allowed = MM_MODEM_MODE_3G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G, 2G preferred */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_2G;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G, 3G preferred */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_3G;
+    g_array_append_val (combinations, mode);
+
+    /* Filter out those unsupported modes */
+    filtered = mm_filter_supported_modes (all, combinations);
+    g_array_unref (all);
+    g_array_unref (combinations);
+
+    g_simple_async_result_set_op_res_gpointer (simple, filtered, (GDestroyNotify) g_array_unref);
+    g_simple_async_result_complete (simple);
+    g_object_unref (simple);
+}
+
+static void
+load_supported_modes (MMIfaceModem *self,
+                      GAsyncReadyCallback callback,
+                      gpointer user_data)
+{
+    /* Run parent's loading */
+    iface_modem_parent->load_supported_modes (
+        MM_IFACE_MODEM (self),
+        (GAsyncReadyCallback)parent_load_supported_modes_ready,
+        g_simple_async_result_new (G_OBJECT (self),
+                                   callback,
+                                   user_data,
+                                   load_supported_modes));
+}
 
 /*****************************************************************************/
 /* Load initial allowed/preferred modes (Modem interface) */
@@ -275,6 +357,10 @@ set_allowed_modes (MMIfaceModem *self,
             a = 1;
         else if (preferred == MM_MODEM_MODE_3G)
             a = 2;
+    } else if (allowed == MM_MODEM_MODE_ANY &&
+               preferred == MM_MODEM_MODE_NONE) {
+        b = 2;
+        a = 0;
     }
 
     if (a < 0 || b < 0) {
@@ -1149,6 +1235,8 @@ iface_modem_init (MMIfaceModem *iface)
 {
     iface_modem_parent = g_type_interface_peek_parent (iface);
 
+    iface->load_supported_modes = load_supported_modes;
+    iface->load_supported_modes_finish = load_supported_modes_finish;
     iface->load_allowed_modes = load_allowed_modes;
     iface->load_allowed_modes_finish = load_allowed_modes_finish;
     iface->set_allowed_modes = set_allowed_modes;
diff --git a/plugins/option/mm-broadband-modem-option.c b/plugins/option/mm-broadband-modem-option.c
index 4c63f3db..42d9570e 100644
--- a/plugins/option/mm-broadband-modem-option.c
+++ b/plugins/option/mm-broadband-modem-option.c
@@ -35,11 +35,12 @@
 static void iface_modem_init (MMIfaceModem *iface);
 static void iface_modem_3gpp_init (MMIfaceModem3gpp *iface);
 
+static MMIfaceModem *iface_modem_parent;
 static MMIfaceModem3gpp *iface_modem_3gpp_parent;
 
 G_DEFINE_TYPE_EXTENDED (MMBroadbandModemOption, mm_broadband_modem_option, MM_TYPE_BROADBAND_MODEM, 0,
                         G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM, iface_modem_init)
-                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM_3GPP, iface_modem_3gpp_init));
+                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM_3GPP, iface_modem_3gpp_init))
 
 struct _MMBroadbandModemOptionPrivate {
     /* Regex for access-technology related notifications */
@@ -57,6 +58,88 @@ struct _MMBroadbandModemOptionPrivate {
 };
 
 /*****************************************************************************/
+/* Load supported modes (Modem interface) */
+
+static GArray *
+load_supported_modes_finish (MMIfaceModem *self,
+                             GAsyncResult *res,
+                             GError **error)
+{
+    if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (res), error))
+        return NULL;
+
+    return g_array_ref (g_simple_async_result_get_op_res_gpointer (G_SIMPLE_ASYNC_RESULT (res)));
+}
+
+static void
+parent_load_supported_modes_ready (MMIfaceModem *self,
+                                   GAsyncResult *res,
+                                   GSimpleAsyncResult *simple)
+{
+    GError *error = NULL;
+    GArray *all;
+    GArray *combinations;
+    GArray *filtered;
+    MMModemModeCombination mode;
+
+    all = iface_modem_parent->load_supported_modes_finish (self, res, &error);
+    if (!all) {
+        g_simple_async_result_take_error (simple, error);
+        g_simple_async_result_complete (simple);
+        g_object_unref (simple);
+        return;
+    }
+
+    /* Build list of combinations */
+    combinations = g_array_sized_new (FALSE, FALSE, sizeof (MMModemModeCombination), 5);
+
+    /* 2G only */
+    mode.allowed = MM_MODEM_MODE_2G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 3G only */
+    mode.allowed = MM_MODEM_MODE_3G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G, 2G preferred */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_2G;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G, 3G preferred */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_3G;
+    g_array_append_val (combinations, mode);
+
+    /* Filter out those unsupported modes */
+    filtered = mm_filter_supported_modes (all, combinations);
+    g_array_unref (all);
+    g_array_unref (combinations);
+
+    g_simple_async_result_set_op_res_gpointer (simple, filtered, (GDestroyNotify) g_array_unref);
+    g_simple_async_result_complete (simple);
+    g_object_unref (simple);
+}
+
+static void
+load_supported_modes (MMIfaceModem *self,
+                      GAsyncReadyCallback callback,
+                      gpointer user_data)
+{
+    /* Run parent's loading */
+    iface_modem_parent->load_supported_modes (
+        MM_IFACE_MODEM (self),
+        (GAsyncReadyCallback)parent_load_supported_modes_ready,
+        g_simple_async_result_new (G_OBJECT (self),
+                                   callback,
+                                   user_data,
+                                   load_supported_modes));
+}
+
+/*****************************************************************************/
 /* Load initial allowed/preferred modes (Modem interface) */
 
 static gboolean
@@ -186,7 +269,8 @@ set_allowed_modes (MMIfaceModem *self,
             option_mode = 3;
         else /* none preferred, so AUTO */
             option_mode = 5;
-    }
+    } else if (allowed == MM_MODEM_MODE_ANY && preferred == MM_MODEM_MODE_NONE)
+        option_mode = 5;
 
     if (option_mode < 0) {
         gchar *allowed_str;
@@ -1140,10 +1224,14 @@ mm_broadband_modem_option_init (MMBroadbandModemOption *self)
 static void
 iface_modem_init (MMIfaceModem *iface)
 {
+    iface_modem_parent = g_type_interface_peek_parent (iface);
+
     iface->modem_after_power_up = modem_after_power_up;
     iface->modem_after_power_up_finish = modem_after_power_up_finish;
     iface->load_access_technologies = load_access_technologies;
     iface->load_access_technologies_finish = load_access_technologies_finish;
+    iface->load_supported_modes = load_supported_modes;
+    iface->load_supported_modes_finish = load_supported_modes_finish;
     iface->load_allowed_modes = load_allowed_modes;
     iface->load_allowed_modes_finish = load_allowed_modes_finish;
     iface->set_allowed_modes = set_allowed_modes;
diff --git a/plugins/sierra/mm-broadband-modem-sierra.c b/plugins/sierra/mm-broadband-modem-sierra.c
index f8cfb743..46d2f3c3 100644
--- a/plugins/sierra/mm-broadband-modem-sierra.c
+++ b/plugins/sierra/mm-broadband-modem-sierra.c
@@ -514,6 +514,109 @@ load_access_technologies (MMIfaceModem *self,
 }
 
 /*****************************************************************************/
+/* Load supported modes (Modem interface) */
+
+static GArray *
+load_supported_modes_finish (MMIfaceModem *self,
+                             GAsyncResult *res,
+                             GError **error)
+{
+    if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (res), error))
+        return NULL;
+
+    return g_array_ref (g_simple_async_result_get_op_res_gpointer (G_SIMPLE_ASYNC_RESULT (res)));
+}
+
+static void
+parent_load_supported_modes_ready (MMIfaceModem *self,
+                                   GAsyncResult *res,
+                                   GSimpleAsyncResult *simple)
+{
+    GError *error = NULL;
+    GArray *all;
+    GArray *combinations;
+    GArray *filtered;
+    MMModemModeCombination mode;
+
+    all = iface_modem_parent->load_supported_modes_finish (self, res, &error);
+    if (!all) {
+        g_simple_async_result_take_error (simple, error);
+        g_simple_async_result_complete (simple);
+        g_object_unref (simple);
+        return;
+    }
+
+    /* CDMA-only modems don't support changing modes, default to parent's */
+    if (!mm_iface_modem_is_3gpp (self)) {
+        g_simple_async_result_set_op_res_gpointer (simple, all, (GDestroyNotify) g_array_unref);
+        g_simple_async_result_complete_in_idle (simple);
+        g_object_unref (simple);
+        return;
+    }
+
+    /* Build list of combinations for 3GPP devices */
+    combinations = g_array_sized_new (FALSE, FALSE, sizeof (MMModemModeCombination), 5);
+
+    /* 2G only */
+    mode.allowed = MM_MODEM_MODE_2G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 3G only */
+    mode.allowed = MM_MODEM_MODE_3G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+
+    /* Non-LTE devices allow 2G/3G preferred modes */
+    if (!mm_iface_modem_is_3gpp_lte (self)) {
+        /* 2G and 3G, 2G preferred */
+        mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+        mode.preferred = MM_MODEM_MODE_2G;
+        g_array_append_val (combinations, mode);
+        /* 2G and 3G, 3G preferred */
+        mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+        mode.preferred = MM_MODEM_MODE_3G;
+        g_array_append_val (combinations, mode);
+    } else {
+        /* 4G only */
+        mode.allowed = MM_MODEM_MODE_4G;
+        mode.preferred = MM_MODEM_MODE_NONE;
+        g_array_append_val (combinations, mode);
+        /* 2G, 3G and 4G */
+        mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G | MM_MODEM_MODE_4G);
+        mode.preferred = MM_MODEM_MODE_NONE;
+        g_array_append_val (combinations, mode);
+    }
+
+    /* Filter out those unsupported modes */
+    filtered = mm_filter_supported_modes (all, combinations);
+    g_array_unref (all);
+    g_array_unref (combinations);
+
+    g_simple_async_result_set_op_res_gpointer (simple, filtered, (GDestroyNotify) g_array_unref);
+    g_simple_async_result_complete (simple);
+    g_object_unref (simple);
+}
+
+static void
+load_supported_modes (MMIfaceModem *self,
+                      GAsyncReadyCallback callback,
+                      gpointer user_data)
+{
+    /* Run parent's loading */
+    iface_modem_parent->load_supported_modes (
+        MM_IFACE_MODEM (self),
+        (GAsyncReadyCallback)parent_load_supported_modes_ready,
+        g_simple_async_result_new (G_OBJECT (self),
+                                   callback,
+                                   user_data,
+                                   load_supported_modes));
+}
+
+/*****************************************************************************/
 /* Load initial allowed/preferred modes (Modem interface) */
 
 typedef struct {
@@ -569,7 +672,10 @@ selrat_query_ready (MMBaseModem *self,
         if (mm_get_uint_from_match_info (match_info, 1, &mode) && mode <= 7) {
             switch (mode) {
             case 0:
-                result.allowed = MM_MODEM_MODE_ANY;
+                result.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+                result.preferred = MM_MODEM_MODE_NONE;
+                if (mm_iface_modem_is_3gpp_lte (MM_IFACE_MODEM (self)))
+                    result.allowed |=  MM_MODEM_MODE_4G;
                 result.preferred = MM_MODEM_MODE_NONE;
                 break;
             case 1:
@@ -583,7 +689,7 @@ selrat_query_ready (MMBaseModem *self,
             case 3:
                 /* in Sierra LTE devices, mode 3 is automatic, including LTE, no preference */
                 if (mm_iface_modem_is_3gpp_lte (MM_IFACE_MODEM (self))) {
-                    result.allowed = MM_MODEM_MODE_ANY;
+                    result.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G | MM_MODEM_MODE_4G);
                     result.preferred = MM_MODEM_MODE_NONE;
                 } else {
                     result.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
@@ -593,7 +699,7 @@ selrat_query_ready (MMBaseModem *self,
             case 4:
                 /* in Sierra LTE devices, mode 4 is automatic, including LTE, no preference */
                 if (mm_iface_modem_is_3gpp_lte (MM_IFACE_MODEM (self))) {
-                    result.allowed = MM_MODEM_MODE_ANY;
+                    result.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G | MM_MODEM_MODE_4G);
                     result.preferred = MM_MODEM_MODE_NONE;
                 } else {
                     result.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
@@ -773,9 +879,10 @@ set_allowed_modes (MMIfaceModem *self,
             idx = 0;
     } else if (allowed == MM_MODEM_MODE_4G)
         idx = 6;
-    else if (allowed == (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G | MM_MODEM_MODE_4G))
+    else if (allowed == (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G | MM_MODEM_MODE_4G) &&
+             preferred == MM_MODEM_MODE_NONE)
         idx = 7;
-    else if (allowed == MM_MODEM_MODE_ANY)
+    else if (allowed == MM_MODEM_MODE_ANY && preferred == MM_MODEM_MODE_NONE)
         idx = 0;
 
     if (idx < 0) {
@@ -1556,6 +1663,8 @@ iface_modem_init (MMIfaceModem *iface)
 
     mm_common_sierra_peek_parent_interfaces (iface);
 
+    iface->load_supported_modes = load_supported_modes;
+    iface->load_supported_modes_finish = load_supported_modes_finish;
     iface->load_allowed_modes = load_allowed_modes;
     iface->load_allowed_modes_finish = load_allowed_modes_finish;
     iface->set_allowed_modes = set_allowed_modes;
diff --git a/plugins/simtech/mm-broadband-modem-simtech.c b/plugins/simtech/mm-broadband-modem-simtech.c
index 359dde50..f7353d88 100644
--- a/plugins/simtech/mm-broadband-modem-simtech.c
+++ b/plugins/simtech/mm-broadband-modem-simtech.c
@@ -37,11 +37,12 @@
 static void iface_modem_init (MMIfaceModem *iface);
 static void iface_modem_3gpp_init (MMIfaceModem3gpp *iface);
 
+static MMIfaceModem *iface_modem_parent;
 static MMIfaceModem3gpp *iface_modem_3gpp_parent;
 
 G_DEFINE_TYPE_EXTENDED (MMBroadbandModemSimtech, mm_broadband_modem_simtech, MM_TYPE_BROADBAND_MODEM, 0,
                         G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM, iface_modem_init)
-                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM_3GPP, iface_modem_3gpp_init));
+                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM_3GPP, iface_modem_3gpp_init))
 
 /*****************************************************************************/
 /* Setup/Cleanup unsolicited events (3GPP interface) */
@@ -445,6 +446,87 @@ load_access_technologies (MMIfaceModem *self,
 }
 
 /*****************************************************************************/
+/* Load supported modes (Modem interface) */
+
+static GArray *
+load_supported_modes_finish (MMIfaceModem *self,
+                             GAsyncResult *res,
+                             GError **error)
+{
+    if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (res), error))
+        return NULL;
+
+    return g_array_ref (g_simple_async_result_get_op_res_gpointer (G_SIMPLE_ASYNC_RESULT (res)));
+}
+
+static void
+parent_load_supported_modes_ready (MMIfaceModem *self,
+                                   GAsyncResult *res,
+                                   GSimpleAsyncResult *simple)
+{
+    GError *error = NULL;
+    GArray *all;
+    GArray *combinations;
+    GArray *filtered;
+    MMModemModeCombination mode;
+
+    all = iface_modem_parent->load_supported_modes_finish (self, res, &error);
+    if (!all) {
+        g_simple_async_result_take_error (simple, error);
+        g_simple_async_result_complete (simple);
+        g_object_unref (simple);
+        return;
+    }
+
+    /* Build list of combinations */
+    combinations = g_array_sized_new (FALSE, FALSE, sizeof (MMModemModeCombination), 5);
+    /* 2G only */
+    mode.allowed = MM_MODEM_MODE_2G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 3G only */
+    mode.allowed = MM_MODEM_MODE_3G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G, 2G preferred */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_2G;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G, 3G preferred */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_3G;
+    g_array_append_val (combinations, mode);
+
+    /* Filter out those unsupported modes */
+    filtered = mm_filter_supported_modes (all, combinations);
+    g_array_unref (all);
+    g_array_unref (combinations);
+
+    g_simple_async_result_set_op_res_gpointer (simple, filtered, (GDestroyNotify) g_array_unref);
+    g_simple_async_result_complete (simple);
+    g_object_unref (simple);
+}
+
+static void
+load_supported_modes (MMIfaceModem *self,
+                      GAsyncReadyCallback callback,
+                      gpointer user_data)
+{
+    /* Run parent's loading */
+    iface_modem_parent->load_supported_modes (
+        MM_IFACE_MODEM (self),
+        (GAsyncReadyCallback)parent_load_supported_modes_ready,
+        g_simple_async_result_new (G_OBJECT (self),
+                                   callback,
+                                   user_data,
+                                   load_supported_modes));
+}
+
+/*****************************************************************************/
 /* Load initial allowed/preferred modes (Modem interface) */
 
 typedef struct {
@@ -731,19 +813,28 @@ set_allowed_modes (MMIfaceModem *self,
                                              user_data,
                                              set_allowed_modes);
 
-    ctx->nmp = 2;  /* automatic mode preference */
-    ctx->naop = 0; /* automatic acquisition order */
+    /* Defaults: automatic search */
+    ctx->nmp = 2;
+    ctx->naop = 0;
 
-    if (allowed == MM_MODEM_MODE_2G)
+    if (allowed == MM_MODEM_MODE_ANY &&
+        preferred == MM_MODEM_MODE_NONE) {
+        /* defaults nmp and naop */
+    } else if (allowed == MM_MODEM_MODE_2G) {
         ctx->nmp = 13;
-    else if (allowed == MM_MODEM_MODE_3G)
+        ctx->naop = 0;
+    } else if (allowed == MM_MODEM_MODE_3G) {
         ctx->nmp = 14;
-    else if (allowed == (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G)) {
+        ctx->naop = 0;
+    } else if (allowed == (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G)) {
+        /* default nmp */
         if (preferred == MM_MODEM_MODE_2G)
             ctx->naop = 3;
         else if (preferred == MM_MODEM_MODE_3G)
             ctx->naop = 2;
-        /* else, auto */
+        else
+            /* default naop */
+            ctx->naop = 0;
     } else {
         gchar *allowed_str;
         gchar *preferred_str;
@@ -830,8 +921,12 @@ iface_modem_3gpp_init (MMIfaceModem3gpp *iface)
 static void
 iface_modem_init (MMIfaceModem *iface)
 {
+    iface_modem_parent = g_type_interface_peek_parent (iface);
+
     iface->load_access_technologies = load_access_technologies;
     iface->load_access_technologies_finish = load_access_technologies_finish;
+    iface->load_supported_modes = load_supported_modes;
+    iface->load_supported_modes_finish = load_supported_modes_finish;
     iface->load_allowed_modes = load_allowed_modes;
     iface->load_allowed_modes_finish = load_allowed_modes_finish;
     iface->set_allowed_modes = set_allowed_modes;
diff --git a/plugins/wavecom/mm-broadband-modem-wavecom.c b/plugins/wavecom/mm-broadband-modem-wavecom.c
index 6f487b42..1ee16e99 100644
--- a/plugins/wavecom/mm-broadband-modem-wavecom.c
+++ b/plugins/wavecom/mm-broadband-modem-wavecom.c
@@ -37,6 +37,8 @@
 
 static void iface_modem_init (MMIfaceModem *iface);
 
+static MMIfaceModem *iface_modem_parent;
+
 G_DEFINE_TYPE_EXTENDED (MMBroadbandModemWavecom, mm_broadband_modem_wavecom, MM_TYPE_BROADBAND_MODEM, 0,
                         G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM, iface_modem_init))
 
@@ -82,18 +84,17 @@ static const WavecomBand3G bands_3g[] = {
 };
 
 /*****************************************************************************/
-/* Supported modes (Modem interface) */
+/* Load supported modes (Modem interface) */
 
-static MMModemMode
+static GArray *
 load_supported_modes_finish (MMIfaceModem *self,
                              GAsyncResult *res,
                              GError **error)
 {
     if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (res), error))
-        return MM_MODEM_MODE_NONE;
+        return NULL;
 
-    return (MMModemMode) GPOINTER_TO_UINT (g_simple_async_result_get_op_res_gpointer (
-                                               G_SIMPLE_ASYNC_RESULT (res)));
+    return g_array_ref (g_simple_async_result_get_op_res_gpointer (G_SIMPLE_ASYNC_RESULT (res)));
 }
 
 static void
@@ -101,9 +102,13 @@ supported_ms_classes_query_ready (MMBaseModem *self,
                                   GAsyncResult *res,
                                   GSimpleAsyncResult *simple)
 {
+    GArray *all;
+    GArray *combinations;
+    GArray *filtered;
     const gchar *response;
     GError *error = NULL;
-    MMModemMode mode;
+    MMModemModeCombination mode;
+    MMModemMode mode_all;
 
     response = mm_base_modem_at_command_finish (MM_BASE_MODEM (self), res, &error);
     if (!response) {
@@ -115,40 +120,71 @@ supported_ms_classes_query_ready (MMBaseModem *self,
     }
 
     response = mm_strip_tag (response, "+CGCLASS:");
-    mode = MM_MODEM_MODE_NONE;
-
-    if (strstr (response, WAVECOM_MS_CLASS_A_IDSTR)) {
-        mm_dbg ("Modem supports Class A mobile station");
-        mode |= MM_MODEM_MODE_3G;
-    }
-
-    if (strstr (response, WAVECOM_MS_CLASS_B_IDSTR)) {
-        mm_dbg ("Modem supports Class B mobile station");
-        mode |= (MM_MODEM_MODE_2G | MM_MODEM_MODE_CS);
-    }
-
-    if (strstr (response, WAVECOM_MS_CLASS_CG_IDSTR)) {
-        mm_dbg ("Modem supports Class CG mobile station");
-        mode |= MM_MODEM_MODE_2G;
-    }
-
-    if (strstr (response, WAVECOM_MS_CLASS_CC_IDSTR)) {
-        mm_dbg ("Modem supports Class CC mobile station");
-        mode |= MM_MODEM_MODE_CS;
-    }
+    mode_all = MM_MODEM_MODE_NONE;
+    if (strstr (response, WAVECOM_MS_CLASS_A_IDSTR))
+        mode_all |= MM_MODEM_MODE_3G;
+    if (strstr (response, WAVECOM_MS_CLASS_B_IDSTR))
+        mode_all |= (MM_MODEM_MODE_2G | MM_MODEM_MODE_CS);
+    if (strstr (response, WAVECOM_MS_CLASS_CG_IDSTR))
+        mode_all |= MM_MODEM_MODE_2G;
+    if (strstr (response, WAVECOM_MS_CLASS_CC_IDSTR))
+        mode_all |= MM_MODEM_MODE_CS;
 
     /* If none received, error */
-    if (mode == MM_MODEM_MODE_NONE)
+    if (mode_all == MM_MODEM_MODE_NONE) {
         g_simple_async_result_set_error (simple,
                                          MM_CORE_ERROR,
                                          MM_CORE_ERROR_FAILED,
                                          "Couldn't get supported mobile station classes: '%s'",
                                          response);
-    else
-        g_simple_async_result_set_op_res_gpointer (simple,
-                                                   GUINT_TO_POINTER (mode),
-                                                   NULL);
+        g_simple_async_result_complete (simple);
+        g_object_unref (simple);
+        return;
+    }
 
+    /* Build ALL mask */
+    all = g_array_sized_new (FALSE, FALSE, sizeof (MMModemModeCombination), 1);
+    mode.allowed = mode_all;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (all, mode);
+
+    /* Build list of combinations */
+    combinations = g_array_sized_new (FALSE, FALSE, sizeof (MMModemModeCombination), 7);
+    /* CS only */
+    mode.allowed = MM_MODEM_MODE_CS;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 2G only */
+    mode.allowed = MM_MODEM_MODE_2G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* CS and 2G */
+    mode.allowed = (MM_MODEM_MODE_CS | MM_MODEM_MODE_2G);
+    mode.preferred = MM_MODEM_MODE_2G;
+    g_array_append_val (combinations, mode);
+    /* 3G only */
+    mode.allowed = MM_MODEM_MODE_3G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G, 2G preferred */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_2G;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G, 3G preferred */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_3G;
+    g_array_append_val (combinations, mode);
+
+    /* Filter out those unsupported modes */
+    filtered = mm_filter_supported_modes (all, combinations);
+    g_array_unref (all);
+    g_array_unref (combinations);
+
+    g_simple_async_result_set_op_res_gpointer (simple, filtered, (GDestroyNotify) g_array_unref);
     g_simple_async_result_complete (simple);
     g_object_unref (simple);
 }
@@ -158,20 +194,16 @@ load_supported_modes (MMIfaceModem *self,
                       GAsyncReadyCallback callback,
                       gpointer user_data)
 {
-    GSimpleAsyncResult *result;
-
-    result = g_simple_async_result_new (G_OBJECT (self),
-                                        callback,
-                                        user_data,
-                                        load_supported_modes);
-
     mm_base_modem_at_command (
         MM_BASE_MODEM (self),
         "+CGCLASS=?",
         3,
         FALSE,
         (GAsyncReadyCallback)supported_ms_classes_query_ready,
-        result);
+        g_simple_async_result_new (G_OBJECT (self),
+                                   callback,
+                                   user_data,
+                                   load_supported_modes));
 }
 
 /*****************************************************************************/
@@ -387,8 +419,6 @@ load_allowed_modes (MMIfaceModem *self,
 typedef struct {
     MMBroadbandModemWavecom *self;
     GSimpleAsyncResult *result;
-    MMModemMode allowed;
-    MMModemMode preferred;
     gchar *cgclass_command;
     gchar *wwsm_command;
 } SetAllowedModesContext;
@@ -473,19 +503,27 @@ set_allowed_modes (MMIfaceModem *self,
                                              callback,
                                              user_data,
                                              set_allowed_modes);
-    ctx->allowed = allowed;
-    ctx->preferred = preferred;
+
+    /* Handle ANY/NONE */
+    if (allowed == MM_MODEM_MODE_ANY && preferred == MM_MODEM_MODE_NONE) {
+        if (mm_iface_modem_is_3g (self)) {
+            allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+            preferred = MM_MODEM_MODE_NONE;
+        } else {
+            allowed = (MM_MODEM_MODE_CS | MM_MODEM_MODE_2G);
+            preferred = MM_MODEM_MODE_2G;
+        }
+    }
 
     if (allowed == MM_MODEM_MODE_CS)
         ctx->cgclass_command = g_strdup ("+CGCLASS=" WAVECOM_MS_CLASS_CC_IDSTR);
     else if (allowed == MM_MODEM_MODE_2G)
         ctx->cgclass_command = g_strdup ("+CGCLASS=" WAVECOM_MS_CLASS_CG_IDSTR);
     else if (allowed == (MM_MODEM_MODE_2G | MM_MODEM_MODE_CS) &&
-             preferred == MM_MODEM_MODE_NONE)
+             preferred == MM_MODEM_MODE_2G)
         ctx->cgclass_command = g_strdup ("+CGCLASS=" WAVECOM_MS_CLASS_B_IDSTR);
     else if (allowed & MM_MODEM_MODE_3G) {
-        if (allowed == (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G) ||
-            allowed == (MM_MODEM_MODE_CS | MM_MODEM_MODE_2G | MM_MODEM_MODE_3G)) {
+        if (allowed == (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G)) {
             if (preferred == MM_MODEM_MODE_2G)
                 ctx->wwsm_command = g_strdup ("+WWSM=2,1");
             else if (preferred == MM_MODEM_MODE_3G)
@@ -1144,6 +1182,8 @@ mm_broadband_modem_wavecom_init (MMBroadbandModemWavecom *self)
 static void
 iface_modem_init (MMIfaceModem *iface)
 {
+    iface_modem_parent = g_type_interface_peek_parent (iface);
+
     iface->load_supported_modes = load_supported_modes;
     iface->load_supported_modes_finish = load_supported_modes_finish;
     iface->load_allowed_modes = load_allowed_modes;
diff --git a/plugins/x22x/mm-broadband-modem-x22x.c b/plugins/x22x/mm-broadband-modem-x22x.c
index 2120b6d2..3afb08cb 100644
--- a/plugins/x22x/mm-broadband-modem-x22x.c
+++ b/plugins/x22x/mm-broadband-modem-x22x.c
@@ -33,8 +33,83 @@
 
 static void iface_modem_init (MMIfaceModem *iface);
 
+static MMIfaceModem *iface_modem_parent;
+
 G_DEFINE_TYPE_EXTENDED (MMBroadbandModemX22x, mm_broadband_modem_x22x, MM_TYPE_BROADBAND_MODEM, 0,
-                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM, iface_modem_init));
+                        G_IMPLEMENT_INTERFACE (MM_TYPE_IFACE_MODEM, iface_modem_init))
+
+/*****************************************************************************/
+/* Load supported modes (Modem interface) */
+
+static GArray *
+load_supported_modes_finish (MMIfaceModem *self,
+                             GAsyncResult *res,
+                             GError **error)
+{
+    if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (res), error))
+        return NULL;
+
+    return g_array_ref (g_simple_async_result_get_op_res_gpointer (G_SIMPLE_ASYNC_RESULT (res)));
+}
+
+static void
+parent_load_supported_modes_ready (MMIfaceModem *self,
+                                   GAsyncResult *res,
+                                   GSimpleAsyncResult *simple)
+{
+    GError *error = NULL;
+    GArray *all;
+    GArray *combinations;
+    GArray *filtered;
+    MMModemModeCombination mode;
+
+    all = iface_modem_parent->load_supported_modes_finish (self, res, &error);
+    if (!all) {
+        g_simple_async_result_take_error (simple, error);
+        g_simple_async_result_complete (simple);
+        g_object_unref (simple);
+        return;
+    }
+    /* Build list of combinations for 3GPP devices */
+    combinations = g_array_sized_new (FALSE, FALSE, sizeof (MMModemModeCombination), 3);
+
+    /* 2G only */
+    mode.allowed = MM_MODEM_MODE_2G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 3G only */
+    mode.allowed = MM_MODEM_MODE_3G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 2G and 3G */
+    mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+
+    /* Filter out those unsupported modes */
+    filtered = mm_filter_supported_modes (all, combinations);
+    g_array_unref (all);
+    g_array_unref (combinations);
+
+    g_simple_async_result_set_op_res_gpointer (simple, filtered, (GDestroyNotify) g_array_unref);
+    g_simple_async_result_complete (simple);
+    g_object_unref (simple);
+}
+
+static void
+load_supported_modes (MMIfaceModem *self,
+                      GAsyncReadyCallback callback,
+                      gpointer user_data)
+{
+    /* Run parent's loading */
+    iface_modem_parent->load_supported_modes (
+        MM_IFACE_MODEM (self),
+        (GAsyncReadyCallback)parent_load_supported_modes_ready,
+        g_simple_async_result_new (G_OBJECT (self),
+                                   callback,
+                                   user_data,
+                                   load_supported_modes));
+}
 
 /*****************************************************************************/
 /* Load initial allowed/preferred modes (Modem interface) */
@@ -168,7 +243,8 @@ set_allowed_modes (MMIfaceModem *self,
     else if (allowed == MM_MODEM_MODE_ANY &&
              preferred == MM_MODEM_MODE_NONE)
         syssel = 0;
-    else if (allowed == (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G))
+    else if (allowed == (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G) &&
+             preferred == MM_MODEM_MODE_NONE)
         syssel = 0;
     else {
         gchar *allowed_str;
@@ -264,8 +340,12 @@ mm_broadband_modem_x22x_init (MMBroadbandModemX22x *self)
 static void
 iface_modem_init (MMIfaceModem *iface)
 {
+    iface_modem_parent = g_type_interface_peek_parent (iface);
+
     iface->load_access_technologies = load_access_technologies;
     iface->load_access_technologies_finish = load_access_technologies_finish;
+    iface->load_supported_modes = load_supported_modes;
+    iface->load_supported_modes_finish = load_supported_modes_finish;
     iface->load_allowed_modes = load_allowed_modes;
     iface->load_allowed_modes_finish = load_allowed_modes_finish;
     iface->set_allowed_modes = set_allowed_modes;
diff --git a/plugins/zte/mm-broadband-modem-zte.c b/plugins/zte/mm-broadband-modem-zte.c
index e7d190ad..d4f4f0f8 100644
--- a/plugins/zte/mm-broadband-modem-zte.c
+++ b/plugins/zte/mm-broadband-modem-zte.c
@@ -250,6 +250,100 @@ modem_power_down (MMIfaceModem *self,
 }
 
 /*****************************************************************************/
+/* Load supported modes (Modem interface) */
+
+static GArray *
+load_supported_modes_finish (MMIfaceModem *self,
+                             GAsyncResult *res,
+                             GError **error)
+{
+    if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (res), error))
+        return NULL;
+
+    return g_array_ref (g_simple_async_result_get_op_res_gpointer (G_SIMPLE_ASYNC_RESULT (res)));
+}
+
+static void
+parent_load_supported_modes_ready (MMIfaceModem *self,
+                                   GAsyncResult *res,
+                                   GSimpleAsyncResult *simple)
+{
+    GError *error = NULL;
+    GArray *all;
+    GArray *combinations;
+    GArray *filtered;
+    MMModemModeCombination mode;
+
+    all = iface_modem_parent->load_supported_modes_finish (self, res, &error);
+    if (!all) {
+        g_simple_async_result_take_error (simple, error);
+        g_simple_async_result_complete (simple);
+        g_object_unref (simple);
+        return;
+    }
+
+    /* Build list of combinations */
+    combinations = g_array_sized_new (FALSE, FALSE, sizeof (MMModemModeCombination), 5);
+
+    /* 2G only */
+    mode.allowed = MM_MODEM_MODE_2G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+    /* 3G only */
+    mode.allowed = MM_MODEM_MODE_3G;
+    mode.preferred = MM_MODEM_MODE_NONE;
+    g_array_append_val (combinations, mode);
+
+    if (!mm_iface_modem_is_3gpp_lte (self)) {
+        /* 2G and 3G */
+        mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+        mode.preferred = MM_MODEM_MODE_NONE;
+        g_array_append_val (combinations, mode);
+        /* 2G and 3G, 2G preferred */
+        mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+        mode.preferred = MM_MODEM_MODE_2G;
+        g_array_append_val (combinations, mode);
+        /* 2G and 3G, 3G preferred */
+        mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G);
+        mode.preferred = MM_MODEM_MODE_3G;
+        g_array_append_val (combinations, mode);
+    } else {
+        /* 4G only */
+        mode.allowed = MM_MODEM_MODE_4G;
+        mode.preferred = MM_MODEM_MODE_NONE;
+        g_array_append_val (combinations, mode);
+        /* 2G, 3G and 4G */
+        mode.allowed = (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G | MM_MODEM_MODE_4G);
+        mode.preferred = MM_MODEM_MODE_NONE;
+        g_array_append_val (combinations, mode);
+    }
+
+    /* Filter out those unsupported modes */
+    filtered = mm_filter_supported_modes (all, combinations);
+    g_array_unref (all);
+    g_array_unref (combinations);
+
+    g_simple_async_result_set_op_res_gpointer (simple, filtered, (GDestroyNotify) g_array_unref);
+    g_simple_async_result_complete (simple);
+    g_object_unref (simple);
+}
+
+static void
+load_supported_modes (MMIfaceModem *self,
+                      GAsyncReadyCallback callback,
+                      gpointer user_data)
+{
+    /* Run parent's loading */
+    iface_modem_parent->load_supported_modes (
+        MM_IFACE_MODEM (self),
+        (GAsyncReadyCallback)parent_load_supported_modes_ready,
+        g_simple_async_result_new (G_OBJECT (self),
+                                   callback,
+                                   user_data,
+                                   load_supported_modes));
+}
+
+/*****************************************************************************/
 /* Load initial allowed/preferred modes (Modem interface) */
 
 static gboolean
@@ -413,7 +507,12 @@ set_allowed_modes (MMIfaceModem *self,
             pref_acq = 2;
         else /* none preferred, so AUTO */
             pref_acq = 0;
-    } else if (allowed == (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G | MM_MODEM_MODE_4G)) {
+    } else if (allowed == (MM_MODEM_MODE_2G | MM_MODEM_MODE_3G | MM_MODEM_MODE_4G) &&
+               preferred == MM_MODEM_MODE_NONE) {
+        cm_mode = 0;
+        pref_acq = 0;
+    } else if (allowed == MM_MODEM_MODE_ANY &&
+               preferred == MM_MODEM_MODE_NONE) {
         cm_mode = 0;
         pref_acq = 0;
     } else if (allowed == MM_MODEM_MODE_4G) {
@@ -679,6 +778,8 @@ iface_modem_init (MMIfaceModem *iface)
     iface->modem_power_down_finish = modem_power_down_finish;
     iface->load_access_technologies = load_access_technologies;
     iface->load_access_technologies_finish = load_access_technologies_finish;
+    iface->load_supported_modes = load_supported_modes;
+    iface->load_supported_modes_finish = load_supported_modes_finish;
     iface->load_allowed_modes = load_allowed_modes;
     iface->load_allowed_modes_finish = load_allowed_modes_finish;
     iface->set_allowed_modes = set_allowed_modes;