I have several SIM cards enabled for NB-IoT network that correctly operate on some BG96 modems, but fail to register on one particular BG96 (same firmware as the other ones).
AT+CEREG alway ends up with status 3 = registration denied on this particular modem.
Is it possible that specific IMEI is “banned” or locked out from the network provider? I read somewhere that wrong configuration of the modem can lead to that IMEI+SIM combination to be blocked.
What could be the reason of such a permanent block?
All the modems have been configured the same way with “nwscanmode”=3, “iotopmode”=1 and specific LTE Band B20.
When manually setting AT+COPS=1,2,“22210”,9 I receive +CME ERROR: 13 or 30.
The other modems work just fine with the default +COPS=0 (auto).