I just tried to start with some new service provider so I opt for uninor , and believe me their plans are really nice and very lucrative. Their customer service is also very nice.
They also had a good option recently they were giving the VIP numbers in a very low rate and on the same time they were giving more talk time. These may be a business gimmick but middle class people who wanted to buy some VIP numbers which is not possible in other like Vodafone, Airtel, idea, etc.