Jio sim is best sim in India till now.It provide their users 4G network.The best thing is it is FREE till 31 march 2017.It provides free 4G internet and free calls.Apart from its free cost it is also gud in many ways.The speed of internet is very fast.The coverage of network is very wide and reach many part of India.The network also comes in underground area, parking area.It is free of cost.You just need your aadhar card to buy this sim.This is best.Just try it you will surely like it.