this SIM5218 AT command manual - Cooking Hacks

SIM5218 Serial AT Command Set
9 Network Service Related Commands
9.1 AT+CREG Network registration
Description
Write command controls the presentation of an unsolicited result code +CREG: when =1
and there is a change in the ME network registration status.
Read command returns the status of result code presentation and an integer which shows
whether the network has currently indicated the registration of the ME.
SIM PIN References
NO 3GPP TS 27.007
Syntax
Test Command
AT+CREG=
Read Command
AT+CREG
Responses
+CREG: (list of supported s)
OK
Responses
+CREG: ,[,,]
OK
ERROR
+CME ERROR:
Write Command
AT+CREG =
Execution Command
AT+CREG
Responses
OK
ERROR
+CME ERROR:
Responses
Set default value(=0):
OK
Defined values
0 – disable network registration unsolicited result code
1 – enable network registration unsolicited result code +CREG:
2 – there is a change in the ME network registration status or a change of the network cell:
+CREG: [,,]
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5/15/2012