I should mention you don't need wifi calling with T-Mobile because for FREE T-Mobile can send you a personal Cellspot that uses your wifi. I have 5 bars at home, before I had 1. Also its range is about 1000 - 1500 feet. This makes LTE work instead of relying on wifi calling which is buggy on any phone because it has to determine whichever is better based on your location to the router. I also would mention I also have the Asus T-Mobile wifi calling router because my wife has a LG. Sense we had the cellspot her phone never used it as her phone simply gets LTE now.