Free 10 gb 3g in airtel

its absolutely free 3g internet of 10gb data of download

1.send 3g ---> 121
2.it shows its shows two options
   *.data plans
   *.deactivate 3g
    reply with one
3.its shows 11 datas which you want activate.....remember the sixth options is of rs.1250 of free 10gb plan
4.reply with 6
5.you will receive an conformation sms...reply with 1
6.when you receive the final conformation sms your 10gb of 3g data is activated .......you can check your 3g
   balance by *123*11#