Reliance jio is very famous now. I am using reliance jio from its preview offer and the speed is realy good but now days speed is not like true 4g but as it is giving free internet and voice calls so every body wants it . but I sdvise to icrease the speed as they are selling the brand on the name of true 4g.and also there is also not a good network in all areas but in some areas it is not so bad and there is also problem in voice calling I hope that jio will resolve all these problems