After a protracted battle with AT&T (one of the reasons I left, their customer service is appalling) I finally have the phone unlocked. The first oddity is that when I'm connected to WiFi, it no longer tells me what type of cell signal (3G, 4G, LTE) I have. Not a big deal, but odd. Second, when I search "T-Mobile" in the Windows Store I'm not only missing the WiFi Calling app, I'm missing T-Mobile TV, and My Account. So my first challenge appears to be getting carrier specific apps to show up in the store... Any helpers?