Hello im going to share my experience with Reliance jiofi.
I bought reliance jiofi few months ago and from that I havent enjoyed 4g speed ever . the speed have never crossed above 20kb/s.
l asked other also but they were very impressed by jiofi speed but somehow in my area jio doesnt work at all . after one recharge I have stopped using it.
connection wise also it sucks as the signal is always low or most of the times no network. I have also filled an request and a complain about my area being a no network zone for jio network but I havent yet received any response.