Reliance jio is a very interesting and addicting offer from the company. It is the best network for those who have the compatible devices and have made their proper connection. The speed is excellent as far as other networks are concerned. And as for now its calling problem has been solved mostly. The main issue for the calling problem is switching networks as I have seen in many cases. The fastest speed I have experienced is 1gbps without the help of any other network boosting apps. As for the calling I have used it continuously for around 1 hour without any network errors.