COM AT+CGATT - GPRS attach or detach
COM V1.0	10.05.2005	 T. Kleinmann

from attglobals import *

AT+CGATT=?
WAITFOR (1,'+CGATT: (0,1)')

AT+CGATT=0
WAIT FOR OK

AT+CGATT?
WAITFOR (1,'0')

AT+CGATT=1
WAIT FOR OK

WAIT 2000

AT+CGATT?
WAITFOR (1,'1')

AT 
WAIT FOR OK