Reliance released a sim called jio sim it is very fantastic sim its speed is amazing its signle is very good to buy this sim you want have an adharcard.
it can available in some stores I want share a incident that in my village there is not network for any other sim when I buy the jio sim I got full signle and I got internet connection that to 4g.:-):-):-):-):-):-).
it will not work in 3g mobies it need a 4g mobile and if you dont have a 4g mobile the sim will not works