Use Extra Initialization Command...!!
Goto Control Panel->Phone And Modem->Select Modem Tab->Click On your Modem->Select Properties->Goto Advanced Tab And Insert Extra Initialization Command..
It Will Work...
Copy This Extra Initialization Command This Is For Airtel, You Can Replace airtelgprs.com With Your Service Provider's APN:
AT+CGDCONT=2,"IP","airtelgprs.com","",0,0



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