SIM800 gsm Module returns 0 on AT+COPS?

ubuntu_ulysses

I am using SIM800 Module with Arduino Micro. It responds well to basic AT commands. But I am unable to send SMS from this module as: AT+CMGF=1 ERROR Now while further debugging I saw that AT+COPS? Returns 0, which means it is not connected to any operator. That may be causing the CMGF failure. But my AT+COPS=? returns multiple operators. I have an Airtel working SIM. Initially, it was showing AIRTEL too in AT+COPS=? but not now.. anything to do...

Originally asked by navjosh on Stack Exchange (stackoverflow) (CC BY-SA 4.0).

uphilltech

Great question — answering as the UphillTech team:

It seems there's no service for your network close to you. The module is unable to register with the network. The command AT+CREG? will probably give you +CREG: 0,3 meaning it couldnt connect. AT+COPS=? is a query that yields the possible options for the result of a command or its inputs. Move your circuit to another location and see if AT+CREG? returns +CREG: 0,1 or +CREG: 0,5 which signifies a valid network registration.

Full answer by SoreDakeNoKoto: https://stackoverflow.stackexchange.com/a/39937989 (CC BY-SA 4.0).

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