Just download tweakware 4.7
Follow the normal settings for airtel 0.00 
Then download 
Busy box and
2G/3g speed optimizer
all you need for this tutorial..1. Open Busy Box and click on Installnow allow the installation to finish, and move to the next step.2. Open your 2G/3G speed optimizerTick "Down Speed Increase " and choose 12/28/7 - max speed and click on Apply Tweak…3. after that Restart your Phone andmove to the next step. And 2G/3g speed optimizer
Then enjoy your airtel 0.00 for faster speed