4G LTE is a different technological standard then 3-g. And vo LTE is the technological standard for making phone calls on an LTE network. So when you have LTE service you make phone calls on LTE. So if you live in an area where TMobile works very well your voice over LTE experience should be pretty darn good. Now if you live in an area where TMobile service isn't great then you would experience a lot of dropped calls. It really depends on where you live and how T-Mobile's network is over there. Sent from my moto g(7) using Tapatalk