U HAVE TO BUY NEW/FAKE SIM.
In old sim not wrking.

If U have Using old sim that u r using before 3 months so ur sim Will Be Ok Wd it This Trick.........!!

NOW DIAL 567567
NOW IMMEDIATEKY PRESS "112215"
Disconect call
NOW CALL AGAIN THEN IMMEDIATELY PRESS "112215"
DISCONECT CALL.
NOW IF U GET FIRST MSG ABOUT UNSUFFICIENT BALANCE THEN ITS 100% WORKING.
AND IF U GET MSG ABOUT SETTING THEN U HAVE TO TRY IN NEW SIM.
I HAD ACTIVATED BY THIS METHOD IN MY FREND MOBILE. I HAVE PROOF ABOUT THIS TRICK.
Blance= i hav 0.10rs.
after this msg get then make default setting for nop.
Ip: 100.1.200.99
Port:8080
Apn: airtelwap.com
Homepage: google.com

FOR DEACTIVATE DIAL *567*4#
AND DONT RECHARGE IN YOR SIM IF U WANT TO RECHARGE THEN DEACTIVATE NOP.