Specifications

Chapter 8 – Network Service Commands
Multi-Tech Systems, Inc. AT Commands for EDGE (E1) Modems (S000474A) 118
• Manual network selection is active, and the selected network is available, but login fails due
to one of the following reasons:
∗ #11 ... PLMN not allowed
∗ #12 ... Location area not allowed
∗ #13 ... Roaming not allowed in this location area
In either case, user intervention is required. Yet, emergency calls can be made if any network is
available.
1 Registered to home network
2 Not registered, but ME is currently searching for a new operator.
The ME searches for an available network. Failure to log in until after more than a minute may be
due to one of the following causes:
• No network available or insufficient Rx level.
• The ME has no access rights to the networks available.
• Networks from the SIM list of allowed networks are around, but login fails due to one of the
following reasons:
∗ #11 ... PLMN not allowed
∗ #12 ... Location area not allowed
∗ #13 ... Roaming not allowed in this location area
After this, the search will be resumed (if automatic network search is enabled).
• The Home PLMN or an allowed PLMN is available, but login is rejected by the cell (reasons:
Access Class or LAC).
If at least one network is available, emergency calls can be made.
3 Registration denied
• Authentication or registration fails after Location Update Reject due to one of the following:
∗ #2 ... IMSI unknown at HLR
∗ #3 ... Illegal MS
∗ #6 ... Illegal ME
Either the SIM or the MS or the ME are unable to log into any network. No further attempt is
made to reach or log into a network. User intervention is required. Emergency calls can be
made, if any network is available.
4 Unknown (not used)
5 Registered; roaming. The ME is registered at a foreign network (national or international
network)
<lac>
Two byte location area code in hexadecimal format (e.g., “00C3” equals 193 in decimal).
<ci>
Two byte cell ID in hexadecimal format.
Notes:
• After the "+CREG: 1" (or "+CREG: 5") URC and before the "^SSIM READY" URC it is not sure that outgoing and
incoming calls can be made and short message functions executed. Emergency calls are possible.
Outgoing and incoming calls are always possible AFTER having received the "+CREG: 1" (or "+CREG: 5") and
"^SSIM READY" URCs.
See also Section 20.1, Restricted access to SIM data after SIM PIN authentication.
• This command is not PIN protected.
• This command is not supported in airplane mode.
Example:
AT+CREG=2 Activates extended URC mode.
OK
AT+COPS=0 Forces ME to automatically search network operator.
OK
+CREG: 2 URC reports that ME is currently searching.
+CREG: 1,”0145”,”291A” URC reports that operator has been found.