Airtel mobileoffice trick

Now there is a mega trick to activate mobile office freely. Really that trick works on many phone.
->step1 – you should connect one day pack usually. And then you’ll get a message like ”airtel mobile office will deactivate in next 1 hour” before 24 hours complete.
->step2 - then you should sent a message like GPRS7 TO 56789. Then you may get a message from airtel like ” dear customer your request could not be processed, you have insufficient balance kindly recharge” if your balance below 75rs. U don’t worry, mobile office 7 day pack will be activate