free airtel gprs

hi friends,
I am yogendra,today i am sharing a trick to use free airtel gprs.
Yes i m using airtel gprs (mobile office) from 1 week free of cost.
Only thing you need is balance less then 10 Rs

when you have balance less then 10 rupees activate airtel mobile office by sending message "MOA" to 52818 then you recieve a message that "you have insufficient balance"
again send message now you have mobile office trial for three days.before completion of third day deactivate MO by sending sms "MOD" at 52818 and again activate using same trick you got another free trial of three days.