Vodafone Hack For Free GPRS.
This method has been tested on different mobiles and has been confirmed to be working.
Followng are the Settings you require to configure on your Mobile

Account Name: Vodafone_gprs
Homepage: http://live.vodafone.in
User Name: (blank)
Pass: (blank)
Access Point Settings:-Proxy: Enabled
Proxy Address: 10.10.1.100
Proxy Port: 9401
Data Bearer: Packet Data
Bearer Settings:-Packet Data
Access Point: portalnmms
Network type: IPV4
Authentication: normal

IF that happen this settings is not working then change the proxy port number to:-Proxy Port: 9401
HOME