Siemens MC35 - Manual (Page 108)

AT Command Set
MC35_ATC_01_V03.02 Page 108 of 228 13.03.2002
Unsolicited result code
If <n>=1 and there is a change in the ME network registration status:
+CREG: <stat>
If <n>=2 and there is a change in the ME network registration status or a
change of the network cell:
+CREG: <stat>[,<lac>,<ci>]
Reference
GSM 07.07
Note
Optional parameters will not be displayed during a call.
Example
AT+CREG=2
Activates extended URC mode.
OK
AT+COPS=0
Forces ME to automatically search network
OK
operator.
+CREG: 2
URC reports that ME is currently searching.
+CREG: 1,"0145","291A"
URC reports that operator has been found.