Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 198)

GSM Network Commands
Network Registration +CREG
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WM_DEV_OAT_UGD_049 - 001 VOLUME 2 August 23, 2007
11.2 Network Registration +CREG
11.2.1 Description
This command is used by the application to check the registration status of the
product.
11.2.2 Syntax
Action command
AT+CREG=<mode>
OK
• For <stat> ≠ 3 (nominal case)
Read command
AT+CREG?
+CREG: <mode>,<stat>[,<lac>,<cid>]
OK
• For <stat> = 3 (specific case)
Read command
AT+CREG?
+CREG: <mode>,<stat>[,<rejectCause>]
OK
Test command
AT+CREG=?
+CREG: (list of supported <mode>s)
OK