I am having trouble accessing the SIM card from my cell modem ( Janus Remote Communications – Terminus based on the Telit GC864 ). I get a SIM card failur :?: e messages from a number of AT commands. The SIM card works fine and I get service with my phone. I’ve had the modem unit checked by Janus Remote Com. and it also works fine. The modem will recognize the SIM card and will ask for the SIM pin. After entering the pin using “+cpin” the response is “OK”. However “+creq” and additional “+cpin” requests result in “SIM failure error messages”. I am using a SIM card from ATT - GO phone service with messaging and data features added. I see on this forum that SIMs with this ATT plan have worked for others. I would appreciate any help or suggestions.