I am using Reliance mobile for 4 years and my experience is not so good.
I stick to this company because it is cheap and my contacts, reliance mobile provide average coverage and I need to sit in a corner to surf the net, it provides cheap 3G recharges, usually bad network if bad weather, calling is more worst, call drops is its best friend, call dropping in this network is happened in every two three times, and it is so annoying. customer service is like all others, a computer assistant type human listens all your query and problems, and repeat same thing every time.
I would say Reliance Mobile is Below average.