Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 200)

GSM Network Commands
Network Registration +CREG
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WM_DEV_OAT_UGD_049 - 001 VOLUME 2 August 23, 2007
: location area code
string type; two byte location area code in hexadecimal format
(e.g. "00C3" equals 195 in decimal)
parameter returned for = 1 or 5 and if =2
: cell ID
string type ; two byte cell ID in hexadecimal format
parameter returned for = 1 or 5 and if =2
network registration denied cause
Parameter returned for =3 and if the customer application
has enabled the denied network registration cause with the
+WBHV command.
0 illegal MS
1 illegal ME
2 IMSI unknown
3 bad network authentication
11.2.4 Parameter Storage
The parameter is stored in EPROM using AT&W command. The default
value can be restored using AT&F.