AT+CGID AT command is used to get the SIM card group identifier.
Simcom Module Tutorial
//Get the SIM card group identifier. If 255 is returned, then SIM card doesn't support GID files.
|Keywords||AT+CGID syntax, examples, parameters, error, input, response.|
With Online AT Command Tester tool, you can test this feature.
With Online AT Command Tester tool, you can also get device diagnostic information easily,