When T-Mobile ends 2g/3g support in the US, the N9/N950 will no longer be supported. AT&T's 3g bands never properly supported the N9 everywhere, and AT&T has phased out its 2g. T-Mo has kept 2g up and running this long to support stuff that was the internet of things before there was an internet of things. Burglar alarm backups, lo-jack, and even connected scales, e.g. But now there's a low-power, low data rate 5g service that can finally replace these aging devices on aging networks -- and the N9 is a casualty.