T-Mobile seems to be launching their own (yawning now) line of branded phones called the REVVL series.
The one below is the T-Mobile REVVL T1
http://www.tmonews.com/2017/05/t-mobile-revvl-t1-leak-image-specs-own-brand-phone/
The one below is the T-Mobile REVVL T1
The new phones expected to be launched are called the T-Mobile REVVL series, claims a report from Android Authority. The model you see above is said to be the T-Mobile REVVL T1, which reportedly features a 5.5-inch 1920×1080 display, 13-megapixel rear and 5-megapixel front cameras, 3000mAh battery, and fingerprint reader.
The Android Nougat-powered REVVL T1 is said to be manufactured by TCL, the same company that’s manufacturing the BlackBerry KEYone.
http://www.tmonews.com/2017/05/t-mobile-revvl-t1-leak-image-specs-own-brand-phone/