I have been using jio service since 1½ year . initally it has good network but later its performance of network diminished.
Jio started with the aim of only increasing customer but not with service and network availability.
At first it started to give free data which attracted many customers and after sometime when it finally acheived its goal it started increasing data price and also became a competitive market for other sim.it was jio bussiness strategy to attract customers by providing free internet.which costs other company very much.and if it goes like this then one day jio will become a monopoly market in network providers.so guys use it on your own risk.
now I m using airtel which costs more than jio and also works better than jio.