I brought my jio sim a week a go its to dificult to calling any one we have to try at least 20 to 30 times to call any one and its net speed is some times good some times it is to bad its to bad that some time you cant also send a msg to any one it is not to good and u can only avail the service when u are having 4G cell if u are having 4G cell and your phone is not supported VOLTE then u have to keep your data ON which will cause u reduction of charging