Jio4GVoice app is an app which helps those whose phone doesn’t support volte technology. Whuch means if ur phone does not have Volte technology then u can over volte by using this app. But I hate this app . As a lot of times dont know what happens to this app but m not able to receive call nor cancel the call which is insane. And nowadays ita also showing a lots of ads regarding there offers which is just intolerable. Although the concept is nice and app is easy to use too.But they must do something about that receiving problem.