Helpful AT Commands

AT+COPS?
# For Hologram in Austin, TX this returns
# +COPS: 0,0,"T-Mobile USA"

AT+CSTT?
# +CSTT: "hologram","",""

Check Network Registration

If the second parameter of the response is 1 or 5, it means that network has been registered successfully

AT+CREG?
# Returns -> +CREG: 0,5