Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 287)

GPRS Commands
GPRS Attach or Detach +CGATT
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WM_DEV_OAT_UGD_049 - 001 VOLUME 2 August 23, 2007
14.4 GPRS Attach or Detach +CGATT
14.4.1 Description
This command is used to attach the MT to, or detach the MT from the GPRS service.
After the command has completed, the MT remains in V.25 ter command state [3]. If
the MT is already in the requested state, the command is ignored and the OK
response is returned.
Any active PDP contexts will be automatically deactivated when the attachment state
changes to detached.
14.4.2 Syntax
Action command
AT+CGATT=<state>
OK
Read command
AT+CGATT?
+CGATT: <state>
OK
Test command
AT+CGATT=?
+CGATT: (list of supported <state>s)
OK