Will the Pending Motorola X Pure device work with T-Mobile 4G network and WiFi Calling?
Wired Magazine Review of Moto X Pure
Best answer by smplyunprdctble
The article says "It works on every carrier in the US"
As for WiFi Calling -- that's an unknown -- the only official "Vanilla Android" device that has been confirmed to support T-Mobile's WiFi Calling has been the Nexus 6. The hopes is since it's baked in future devices will be able to do it, but there's no insight on that yet (It wasn't pushed down to the Nexus 5 when it became available earlier this year).