Why does AT+COPS return previously rejected network as "available"?FPLMN is not always updated after a single rejection or failure to register.
AT+CGREG: Modes, parameters, and examplesThis article is a practical overview of how to use the AT+CGREG command.
AT+CEREG: Modes, parameters, and examplesThis article is a practical overview of how to use the AT+CEREG command.
AT+COPS: Modes, parameters, and examplesThis article is a practical overview of how to use the command.
Why you shouldn’t tell your IoT modems to attach/detachUsing AT+COPS=0 and AT+COPS=2 to attach / detach modems to / from the network is often a bad idea.