This trick is Very simple to use with our tutorial posted here. 

Please follow all steps and Enjoy Unlimited Airtel Free GPRS Trick. 

 Airtel Free GPRS With front Query-April 2012:-

Steps:
Create new settings:-
IP address:- 190.129.10.245
Port:- 80

Now Download

 Opmin65 handler.jar and open it and put this front quey:

fb.me/cgi-bin/nph-proxy.cgi/111110A/http/

Let Initializing it and enjoy unlimited surfing and downloading in Opera mini with Airtel front query trick.