HI FRENS TO GET FREE INTERNET ON UR MOBILE(AI*TEL) PLEASE USE THE FOLLOWING SETTINGS AND USE  OPERA MINI 5.1
Create a new setting in your mobile handset
Access Point= airtelgprs.com
Proxy address= 80.239.242.253
Port= 80 (Remember its 80 not 8080) 
Keep balance below 30p

HERE IS THE LINK TO DOWNLOAD OPERA MINI 5.1 

Opera Mini 5.1 & 4.2 free with Airtel Mobile Office !!