APN settings

APN: airtelgprs.com
Proxy: 82.145.210.160
Port: 80

Handler settings

Proxy Type: HTTP
Proxy Server: Use anyone of the following which ever is working

1.ic.bsbportal.com
2.airtellive.com
3.get.hike.in/airtel
4.g.co/freezone
5.airtel.in/data

Save the settings & Enjoy