Forum Discussion
Unlocked s21 Ultra showing as "Unknown Device" and not supporting 5G or Extended Range LTE on My Mobile account
I just bought an unlocked S21 Ultra directly from Samsung. It works great, including the tmobile voicemail app and RCS through the Google messages app. It says I'm connected to 5G on the phone, and...
T-Mobile doesn't have the IMEI in their system so they don't know what the device is. That's why it says unknown device. Even unlocked iPhones not in their system will say the same thing. Everything will work even if it says unknown device. Been that way for all carriers when buying unlocked.
