Airtel block all trick but we r in still working in finding free airtel gprs hacks..
Create new settings as:
Proxy->202.133.60.187
port->80
apn->airtelgprs.com
home page-> 122.170.122.191.t9space.com
Now activate this configuration and Long prss "0" (i.e. Zero )
U can change "t9space.com" with any free proxy name.