This hack is working flawlessly in Mumbai and West India. Not sure of other places, But do give a try and follow back through comments. Note that you 'll be charged 5 or 10 Paise when you start surfing and after that it 'll be free.
Go to Tools | Settings | Connection | Access Points | New Access Point | Use Default Settings.
Settings :
Connection Name - Mobile Office
Data Bearer - Packet Data
Access Point Name - airtelfullmaza
User Name - None
Prompt Password - No
Authentication - Secure
Homepage - http://mobhacks.mofuse.mobi
Proxy - 128.6.192.158
Port - 3127
That's it Surf using your default browser, for FREE now. 3rd Party Browsers can also be used as long as it supports Proxy Surfing.