It turns out the one flagship Windows Phone which will be available on all 3 major US carriers is the HTC One M8 for WIndows, with a support page for the handset popping up on T-Mobile’s website.
The page reviews the handset will support WIFI calling, a feature widely implemented on T-Mobile smartphones, and will otherwise have all the other usual HTC One goodies.
See the page at T-Mobile here and read more about your future handset.
Via TMoNews.