HTC U11 Forum

Support T-Mobile?

As long as it's unlocked or is locked to T-Mobile, it should work.

WiFi calling will only work if the phone comes from T-Mobile, i believe
#2 A bochur, Oct 24, 2017 Last edited: Oct 24, 2017
I've got wifi calling on my Nexus 6P, when i put in the T-Mobile sim card.:p
#3 grunt0300, Nov 8, 2017
If it's like Samsung phones, it will all depend what version it is. US versions should have WiFi calling, Asia versions won't. Basically it depends if the carriers implement Generic Access Network(GAN), in Asia they do not.
#4 mikedt, Nov 8, 2017
Meaning, for example if you have an unlocked AT&T branded U11 you probably won't be able to use wifi calling with a Tmobile SIM installed.

A Nexus device will always have the ability to make wifi calls on any network, whether sold through a carrier or not.

I use unlocked ATT devices on tmobile. Android wifi calling and wifi SMS will not work in this situation, but on my BlackBerry Passport I can use WiFi and make calls, oddly. It even shows AT&T in the network status when I'm using wifi.
#5 Spec2nirvash, Nov 8, 2017
My WiFi calling works perfectly on T-Mobile. In fact, call quality improved over AT&T. Make sure your settings are all selected though for your preferences for WiFi calling.
#6 jimscheiner, Nov 28, 2017
Thanks for the input guys. I'm thinking about the U11+, unlocked on T-Mobile.:p
#7 grunt0300, Dec 7, 2017