Here's the simple trick to use docomo internet free gprs. There is just a slight change in your default settings. So just configure your phone with following settings:
APN: tata.docomo.dive.in
IP: 010.124.094.009
PORT: 8080
HP: any
Just keep the balance low (below 10ps as other wise you will charge as 10kb/10ps)
Now enjoy the full free gprs.
if anyone wants prov file just request it here