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

I found in the More Connections options. And after hours of searching through duck. Go where T-Mobile's ads can't override your search, u have yo select yhe Temporary Network Unlock option so that ur device can access their "partner service providers" and actually use the FREE roaming feature. This was after SEVERAL calls to TMobile asking how to do it. They REFUSE to tell u how ot about that setting because of their advertizements, they have to allow ur roaming and unlock for FREE! They've been getting slapped by the Consumer Protection Law authorities over their FALSE adds about the best setvice coverage. The teick is, u have to fo the temp unlock in advance. I guess we should just assume we wont have service and unlock it ever 30 days when it goes back to default