First of all I encoumtered many apps when I searched for voice caliing app, there are bundles of apps for voice calling out there in playstore but none of them can beat jio 4gvoice, secondly when u install this app and tap(click) on it icon you will notice it interface is quite simple like our android pre installed dialerwhich make it very easy to use, and once you set it to default dial app you will never get any issues again, this app top features is it turn your lte phone into volte what I say, it will use 4g data for calls no extra balance needed, no subcription needed and if you are not using jio network you can install it and activate it through jio wifi or jiofi, what more needed anyway, this app jio4gvoice is quite usefull for all those people who want to experience hd voice calling and free calling app and its also has the call history option all of of it is the best app for calling purpose so far in the playstore available