8.8 Network registration
8.8.1 GSM network registration
To check GSM network registration status enter AT+CREG? into software (for instance
Hyperterminal) Modem will answer in following format:
+CREG: <n>,<stat>[,<lac>,<ci>]
OK
The following table shows the +CREG parameters:
<parameter> Description
<n> 0 Disables the network registration unsolicited result code.
1 Enables the network registration unsolicited result code +CREG: <stat>.
2 Enables the network registration and location information in unsolicited
reports and Read command +CREG:<stat>[,<lac>,<ci>].
The default is 0.
<stat> 0 Not registered, and the ME is not currently searching for a new operator to which to
register.
1 Registered, home network.
2 Not registered, but the ME is currently searching for a new operator to which to register.
3 Registration denied.*
4 Unknown.
5 Registered, roaming.
<lac> Two-byte location area code in hexadecimal format
<ci> Two-byte cell ID in hexadecimal format.
*To manage connecting to network SIM card inserted into the modem must be valid.
For further information about AT commands and their usage, refer to [1].
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