T-Mobile requires that the phone be certified for VoLTE on their network to use Band 12. This is due to there being areas that that only have Band 12 service and thus you wouldn't be able to make phone calls with the phone. Microsoft doesn't care about the Lumia phones and didn't bother to get it certified. One could argue T-Mobile should make it cheaper/easier, but either way, Microsoft chose not to. Maybe they will change their minds going forward, but I wouldn't hold my breath.
05-21-2016 08:29 AM