Here some new (may be you already using) gprs tricks for different Indian operators like Reliance, Airtel, Vodafone, Idea and Docomo for Free GPRS. Enjoy the free internet again with following tricks if work for you.
Reliance Free GPRS Trick:
Just Dial *123*099#
Try at low balance. It'll give you 2.5 GB of free internet browsing on your phone. Though working fine in high balance in my test. You can browse with rcomnet apn also.
Free GPRS Trick:
And download Opera Mini 5.1 from Here to use this trick.