How to Configure Airtel VPN Trick :
APN : airtelgprs.com
At first you Must download the NMD VPN and the config files.

-OK After downloading this config and NMD VPN just Install the VPN.
-Now replace the downloaded config file in the NMD VPN : Program Files folder.
-Run the NMD VPN
Windows 7 and 8 Users : Make sure you have run the Program as the Administrator.
-Just connect the with any of the two servers, if you are experiencing the disconnection problem then try the second config.
-The connection will be established instantaneously.

Download File here

http://thehacker.sextgem.com/files/Airtel_3G_airtelgprs.com_Airteltrickz.com