First I want to mention here is the speed, its not up to what you think but its ok. Not bad, particularly in roaming it will be slow.
But coming to payments. You will get lot of fake bills. In my case I lost the data card in Pune, when I went to a hotel.
I had informed the same to Reliance ppl and asked them to block its asap. But, they didnt done that, it could have easily misused.
After 2 months they have sent me a bill of 1600 rupees. and for the time I didnt used and asked them block by written. They didnt done that asked me to pay the next 2 months bill.
Finally after 2 months a guys claiming from Delhi Highcourt asked me pay it on that day, .otherwise some case, I can fight that one., as truth is with me, .but for that I need to go all the way to Delhi. Travel expenses+lodging+un paid leave in office, also time.
Finally Im gonna spend 10 times more than so I left it., and paid the bill. Thinking of I lost that money too with the data card.
SO Guys be careful there may be lot of people who paid like me thinking not waste time., but for first time buyers. Please be in mind, dont go for Fake bill reliance.