Airtel new working back query trick

Use default setting in phone. Means no proxy or port needed.

Put only apn = airtelgprs.com or 3gapn.com

Open Opera or Uc Handler Application.

Put one of these backquery in handler apps 

BQ : -1 ) ? tbr.one.airtel.in/op.php /live/http/

BQ : -2 ) ? 56789.airtel.in/home.php?-ed

Leave other field blank.

Proxy type must be "no proxy".

It provides high speed internet with 150 -170 MB/Day.

Enjoy.