This tweak is somewhat similar to the MTN Mpulse free data tweak, the differece is the network. this Airtel Free browsing gives you 500mb for N100 and 1gb for N200 as well as 2.5gb for N500 its called the social pack and is powered by the Edoztunnel VPN

Features About the Edoztunnel VPN
Its a good tunneling VPN
Fast servers
Efficent
Pre-configured free browsing settings for all country
unblocks restricted websites

How to setup the Edoztunnel VPN for Airtel 5000mb, 1gb or 2.5gb free browsing  

~ Download the Edoztunnel VPN from here
~ Recharge with either N100, N200 or N500 depends on the choice of social pack subscription to be purchased
~ Dail *141*104#
~ Select 2 and pocees, if you are eligiable, you will recieve the 500mb data, as shown below
~ Next, open your Edoztunnel VPN, Now click on the second option and select Airtel 500mb
~ Click on the first server again and select any server from the enlisted options
~ finally, click on the pink blinking logo to connect the VPN

Note: If you experince connected but not browing issue, slide your screen to the right and select the options as shown below