Airtel Free 3G Trick

Put your sim in a 3G mobile
Send a SMS as 3G to 121
You will receive a message.
just replay with data plans
You will again receive a message with available dataplans
Select the 10GB plan and replay
You free 10GB 3G will be activated within 4 hours
 Please note: Keep minum balance before activating this airtel free 3G...
Note- Its not tested by me