Account Name : Vodafone_gprs
Homepage : http://live.vodafone.in [or anything useful]
User Name: (not required)
Password :(not required)
Access Point Settings:[ to be configured in mobile,if not already given]
Proxy: Enabled
Proxy Address:  10.10.1.100
Proxy Port: 9401
Data Bearer: Packet Data
Bearer Settings: [to be setup in mobile]
Packet Data Access Point: portalnmms
Network type: IPV4
Authentication: normal
User Name :(not required)
Password :(not required)

After configuring these settings in your Vodafone mobile,check for connection.If you are unable to access free internet[GPRS] on your vodafone mobile using this trick,then switch off your mobile,reinsert sim card and switch ON again.Now you can browse on your mobile for free