service providers have varying service qualities in different circles....for eg. in Gujarat, Vodafone has the best service. while in mumbai Airtel has the best service...(Service as in...good/quick call connection, lower no. of call drops, getting network in secluded places like basements, etc). here in ahmedabad even on a normal day, Idea networks remain busy....its the worst here...Airtel flooded me with so many advertisements that i disconnected it just after 1 month of getting it. and so finally vodafone suited me....and unlike wat Nvidia8800 said...Vodafone here has very few schemes compared to airtel.
i suggest u choose on the basis of these..rather than the schemes....cos mostly all service providers have almost similar schemes...and every scheme has a "catch" to it....