Motorola g20 Developer's Manual page 235

Example
AT+CGACT=?
+CGATT: (0, 1)
OK
AT+CGACT?
+CGACT: 1,0
+CGACT: 2,0
+CGACT: 3,0
OK
AT+CGACT=1
ERROR
In some GPRS networks, for example Germany, +CGACT is not supported. The ATD*99# command can be used
to make a connection.
Note
4.12.1.6 +CGATT, GPRS Attach or Detach
This command attaches/detaches the MT to/from the GPRS service. When the command has completed, the MT remains in
V.25ter command state. If the MT is already in the requested state, the command is ignored and the OK response is returned. If
the requested state cannot be achieved, an ERROR or +CME ERROR response is returned. Extended error responses are enabled
by the +CMEE command. Any active PDP contexts will be automatically deactivated when the attachment state changes to
detached.
Set Command
The Set command attaches/detaches the MT to/from the GPRS service.
Command
AT+CGATT= [<state>]
98-08901C68-O
//GPRS network not present.
Response/Action
OK
or:
+CME ERROR: <err>
AT Commands Reference
221