My experience with Reliance Smart is too bad. I started using Reliance Smart on 2009. There was a offer that after 11 pm Reliance to Reliance call charge will be 5 paisa/minute. It was a good offer so a group of friend collected Reliance sim to enjoy it.
But for maximum of the time the call clarity is too poor. The connection is so pathetic that to talk 5 minute you have cut and call at least 10 times. Even the connections like tata docomo, Uninor is better that it. Now I am talking about kolkata area now when I visited any village area there was no network coverage and even in city like Nagpur, Bilashpur the same pathetic condition of Reliance network. At last I changed my connection to Airtel now everything is fine .