Unlimited Mobile Broadband

I want to get a mobile broadband connection, but I need it to have an unlimited tariff plan. I have searched the net for 2-3 days now have been unable to find any service provider who has unlimited plans on a mobile broadband connection. I've have registered with the forum hoping that someone will be able to help me find an unlimited mobile broadband provider.
I don't think you can get something such as unlimited data, but yes a data plan with a lot of data is available like NikeshPatel has mentioned.
The only service providers who give near to unlimited data plans are MTNL and BSNL, apart from this no other service provider gives unlimited plans.