Unlocked s21 Ultra showing as "Unknown Device" and not supporting 5G or Extended Range LTE on My Mobile account

Futbol.dad68 wrote:

I have the same issue, my Samsung S21 Ultra is showing up as unknown device. I was looking into Xfinity Mobile since Verizon has better coverage in my neighborhood but they're telling me my device is not compatible. It can't be true since Xfinity sells the S21 Ultra. Not sure exactly, but I'm thinking it's related to this issue, which is frustrating.

Is your device a T-Mobile branded device and if so where was it bought from ? 

It it's a T-Mobile branded device bought from any authorized dealer other than TMobile directly then  it's  the same issue as me. 

Because T-Mobile state that they can't process sim unlock requests because the IMEI isn't recognized due to it not being in their system. 

Ive already filed a complaint to the FCC. Since it's unacceptable that a phone should remain sim locked with no avenue to get it unlocked due to system limitations.