Right im on my Nokia lumia 1520.3. Its working great. I like to flip flop from At&t to Tmobile. Right now on Tmobile this 1520 does not get that new band 12 Tmobile uses. According to specs the 950xl can use that frequency. Im in the Suburban Philadelphia pa market. Would it be worth buying the 950xl for that reason? Does anyone else use tmobile in the USA and how is been?