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...
BYOD devices don't usually work for domestic roaming on T-Mobile due to the device not being a T-Mobile or US Cellular device in the case of West Virginia. The device showing as an unknown device is normal for any device not sold to you by T-Mobile.
