Using Proxy And port to surf free internet on Airtel..

    Create a new accesspoint name [APN] as Airtelgprs.com
    Proxy as  66.90.76.90
    Port as 80
    Now set Homepage as 0.facebook.com
    And Set this configuration as default or activate it

Then open Home page or in the Enter address or go to address
Enter

    0.facebook.com
    or m.twitter.com
    or  fb.me

Balance Condition : above 30 paise . Now enjoy Free internet access on your Airtel Mobile