Rainbow Electronics FARGO MAESTRO 100 (with TCP_IP) - Manual (Page 276)

GPRS Commands
GPRS Mobile Station Class +CGCLASS
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WM_DEV_OAT_UGD_049 - 001 VOLUME 2 August 23, 2007
14.1.5 Examples
Command Responses
AT+CGCLASS=? +CGCLASS: ("CG","CC","B")
OK
AT+CGCLASS="CC"
Note: Enter GSM mode
OK
AT+CGCLASS? +CGCLASS: "CC"
OK
14.1.6 Notes
If the MT is GPRS attached, when the action command is issued with a <class>="CC"
specified, a GPRS detach request is sent to the network.
If the MT is GSM attached, when the action command is issued with a <class>="CG"
specified, a GSM detach request is sent to the network.
During switch-On in CG class, the MS always performs an automatic GPRS attach
(the ATTACH-STATUS parameter of +WGPRS is ignored).
If the MS is not already GPRS attached, when switching from B/CC class to CG class
then no automatic GPRS attach is performed.