Idea has been the revolutionary mobile services provider with the state of art facilities being provided by them. Now they are the only provider with the 1800 MHZ frequency and the 32 bit sim which is one of the best of its kind in the arena.
Its new scheme which has just begun few time back which is now under the belt of corporate scheme as well, in which they are offering the full year services without any monthly rental, free roaming, sms @ 0.99 locally and 3.00 while roaming, 1.99 locally, 3.99, and 4.99 for <500 km and >500 km distances and above all a free Kodak camera worth Rs. 995 absolutely free but with a minor condition of the billing cycle after two months idea services usage.
I think in this regard that IDEA is now the best service provider and the king of the market. Its schemes are also good and the connectivity has improved a lot from the recent past. Have a go for the pre paid connection holders, and if you are seriously looking for a reliable service provider then I have IDEA for you. ;)