Vodafone settings:

Account Name: Vodafone_gprs
Homepage: http://live.vodafone.in
User Name: (no need)
Pass: (no need)

Access Point Settings:

Proxy: Enabled
Proxy Address: 10.10.1.100
Proxy Port: 9201
Data Bearer: Packet Data

Bearer Settings:

Packet Data Access Point: portalnmms
Network type: IPV4
Authentication: normal
User Name: (no need)
Password: (no need)

These are the settings of Vodafone (Chennai & TN)