To get free internet on bsnl gprs:
do the following settings:
apn: bsnlmms
proxy: 10.188.128.128
port:: 8080
(this server will remain online for 1 hour. it will get OFF at 2.30 PM and again ON in 5.30 PM. after that NEW IP will be released.)
That's it now you can enjoy free 2g services.