Remove all the Airtel Settings likemobile office, airtel live from your Mobile.
2]Then Activate GPRS Pack Of Rs10(100Mb) By Dialling *567*1#.
3]Activate This Plan Between 6pm to 6:30pm. Its very important, this is the time that airtel servers are busy.
4]Use 7 Or 8 Mb data.
5]Now Remove Your Sim Card.
6]Then Put Sim Card Between 11:40 To 11:45.
7]Now Use This 2 or 3 Mb Data (only browsing).
8]Main Trick is Don't Disconnect Internet but Browse continuously And Download.
9]You see Data Account Bal By Dailing *123*7# (0.00Mb) But Can Use Internet Unlimited.
10]Follow This Steps Continuouly for 7 Or 8 Days.
11]After 8 Day Dont Active Rs 10 Plan And Use Internet.
12]Bal Must Be 0.00.
13] Now Your Airtel Internet is Free With Unlimited Downloading
AIRTEL WORKING GPRS TRICK