For T-Mobile this looks bad: https://en.wikipedia.org/wiki/T-Mobi...spectrum_chart They are moving 3G UMTS/HSPA+ from 1700 MHz to 1900 MHz, but it doesn't look like they are finished with this. Anyway, 2100 MHz is missing the point for UMTS. And, T-Mobile's LTE will live on 1700 MHz. If this is the final spec, I'll have to skip this device, since T-Mobile is the only sane provider with decent coverage here (unless LTE will be supported on the proper frequency).