Siemens M1 User Manual
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GSM M1 Module, English: A24859-N4000-A100-1-7677
gsm-m1-e.fm
Technical reference section
6.3.96
Data transmission is possible only if the GSM module is registered in the network. This
command provides you with information on the module’s registration status in the net-
work.
AT+CREG - Network registration
AT+CREG
Option
Result
AT+CREG?
Displays mode n and the
registration status < CREG STATUS n>.
AT+CREG=?
Displays a list of the modes supported.
AT+CREG=<mode n>
Selects a new mode.
AT+CREG?
Command
AT+CREG?
Result code
+CREG:
<mode n>, <CREG status>
<mode n>
n= [0]
0
Changes in registration status are not forwarded to the PC.
<CREG status>
status= [0..3]
STATUS n
Meaning
Explanation
0
Not registered;
ME is not search-
ing for a new oper-
ator.
No network operator found; the GSM module
cannot register, nor is it searching for a new
operator.
1
Registered
The GSM module has successfully registered in
the network and all services are available.
2
Not registered,
but ME is
searching for a
new operator.
The M1 is not registered but is searching for a
new network operator.
See AT+COPS, commands relating to network
operator selection.
3
Registration
denied.
The selected network cannot be accessed at
this time.
4
Unknown
The current status in relation to the network
cannot be determined at this time.