Free Airtel 3G Trick(January 2012)

Hi friends,i m back with latest free airtel 3G trick.
Best thing of this trick is that you don't have to need install any application.
No need of change configuration of  settings.
You have to type this message"3G"
In next step send this msg to number 121.
This is the request to activate the 3G service in your  number.
After a short while,you will recieve the msg that your 3G service has been now activated.
They will send you their 3G plans list.
Just select the one 3G package.
In next step choose
12 or 13 for 2.5 or 4 GB.
Tha'ts it.
Enjoy.