helpers: allow [A-F] range in operator-specific ICCID account number

There are operators (e.g. the Chinese CMCC operator) that abuse the
fact that 4 bits are used to store the BCD encoded numbers, and also
use the [A-F] range as valid characters for the ICCID in the operator
specific account number part. Haven't seen any documentation where
this format with [A-F] characters is explicitly allowed, but I have
seen multiple real cases where it happens. E.g.:

  898602F9091830030220
  898602C0123456789012

This patch also removes the 'last F' validation, used when reading
19-digit ICCIDs with +CRSM, as it no longer applies.

0 files changed, 0 insertions, 0 deletions