Does anyone know if there is a way to verify that the SMS service is available - ideally before trying to send an SMS and getting an error code? Presumably theres an AT command to query the status of the modem, but where do I start looking ?
Basically I want my app to be able to recognise and reject a duff SIM card at start up. I check the initialisation state of the SIM but that always returns OK even with a bad SIM. Presumably that just means that the SIM data has been read out OK.