Hi I am jio user and itz good it is totally free but somewhere network is very poor some where you can not use jio services you can not make call with out internate and you have to try any time for one make a single call.so please do not buy jio sim but you can buy if your location getting a jio network so there jio sim will work very well.but itz not possible that you will get full network to any where. and second thing is jio sim is a 4g network and it is not work on 3g mobiles it is work only 4g lte