I first heard that jio was giving problems to the smartphones so I was not interested but after 3 months of its arrival all my friends and family members were using without any problems so I too started to use it best for 4G users and now jio provided hardware through which we can use it in 2g and 3g phones also the best features it contains is free voice calls.as the free net offer expires at end of march but voice calls are still free so I recommend to try it for sure.