I got my first jio sim on october, now I have 3 sim jio sim card for each of my family members, the call quality is average, it works good in volte mobile, but in non volte phones we have to use jio 4g voice app by jio, which is not so good, first we have to on jio ne, then go to jio 4g app, then try and try to call whome you are calling, it have very less chance that it will connect to another operater on singal try, but jio to jio connection are fast, the major problem for non volte phones that, if internet is off, no one will able to call, you, every time you have to continue you jio net on, which consumes lot of battery, now the internet, i never felt like it that I am using 4g, after I get my sim, i have never get speed abobe 140 kbps, but it is free, i cant complaine about this, now is it average type of operater, lets see how this operater comes out in future