I have figured out the free internet trick in Aircel using PD Proxy. It works on Open UDP port. Skipping all blah-blah things I am just going to tell how to do this in simple steps.
1. First download the PD proxy and Extract it.
2. Sign up here and get a user name and password. (Don’t forget to activate the mail sent on your email id by clicking on that.)
3. Now Choose Demo Server 1 or Server 2 in Server and Protocol Option and Choose UDP.
4. Put your user name and password and Connect. It will take some time to connect after that you can easily browse.