Hello frdzzzzzzzzzzzzz
On ur request I am posting a trick for Free GPRS on Airtel & without saying any thing much more HERE is the Trick.

FIRST MAKE FOLLOWING SETTINGS IN THE MOBILE L:

PROXY:- 94.249.139.2

PORT:- 80

APN:- airtelgprs.com

HOMEPAGE:- 122.170.122.212

HOMEPAGE:- wap.nimbuzz.com

HOMEPAGE:- 203.115.112.5

HOMEPAGE:- d.airtelworld.com

HOMEPAGE:- 122.170.122.201

This trick is working in all part of India.

NOTE:)
1. Use this trick at low balance.
2. Use any one home page at your area
.