<n>: 0 disable network registration unsolicited result code 1 enable network registration unsolicited result code +CREG: <stat> 2 enable network registration and location information unsolicited result code +CREG: <stat>[,<lac>,<ci>] <stat>: 0 not registered, ME is not currently searching a new operator to register to 1 registered, home network 2 not registered, but ME is currently searching a new operator to register to 3 registration denied 4 unknown 5 registered, roaming <lac>: string type; two byte location area code in hexadecimal format (e.g. "00C3" equals 195 in decimal) <ci>: string type; two byte cell ID in hexadecimal format