Appendix C. Useful Configuration Commands
C-3
AT+CREG Network
registration
Test command
AT+CREG=?
Response
+CREG:
list of supported
<n>
s
OK
Parameter
See set command
Read command
AT+CREG?
Response
TA returns the status of result code presentation and an integer
<stat>
which shows whether the network has currently indicated the
registration of the ME. Location information elements
<lac>
and
<ci>
are returned only when
<n>
=2 and ME is registered in the network.
+CREG : <n>, <stat>, [<lac>,<ci>] OK
If error is related to ME functionality:
+CME ERROR: <err>
Parameter
See set command
Set command
AT+CREG=[<n>]
Response
TA controls the presentation of an unsolicited result code
+CREG:<stat>
when
<n>=1
and there is a change in the ME network
registration status or code
+CREG:
<stat>[,<lac>,<ci>]
when
<n>=2
and there is a change of network
cell.
OK
Parameter
<n>
0 disable network registration unsolicited result
code
1 enable network registration unsolicited result
code
+CREG:<stat>
2
enable network registration and location
information unsolicited result code
+CREG:<stat>[,<lac>,<ci>]
<stat>
0 not registered, ME is not currently searching
for a new operator at which to register
1 registered, home network
2 not registered, but ME is currently searching
for a new operator at which to register
3 registration denied
4
unknown
5
registered, roaming
<lac>
string type; two byte location area code in
hexadecimal format (e.g. "00C3" equals 193 in
decimal)
<ci>
string type; two byte cell ID in hexadecimal
format
Unsolicited result code
When
<n>=1
and there is a change in the ME network registration
status:
+CREG: <stat>
When
<n>=2
and there is a change of the network cell:
+CREG: <stat>[, <lac>,<ci>]
Parameter
See set command
Reference
GSM 07.07
Note
