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

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G

Apparently in the situations mentioned, it’s about Samsung phones -- unlocked -- not being compatible with SOMETHING within T-Mobile. Maybe the SIM cards they provide for the unlocked phones aren’t set up correctly. Maybe it even has something to do with an almost passive aggressive way of ‘discouraging’ customers to buy products directly from Samsung.

Whatever it is, it has wrecked the fun and excitement of my new phone.

Interestingly, before I realized what a mess this was going to be, I took advantage of the Samsung watch offer on 2/24. The data lines were added last night, and the phones are being delivered tomorrow, 4/7. I just hope it goes well.

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It won't, unless it is a device purchased from T-Mobile.  The device showing in your account doesn't matter.  Samsung's U1 devices work exceptionally well with T-Mobile. 

this goes for all BYOD correct? not just Samsung phones brought in as a BYOD?

***I like many others come onto this site for assistance and to help others. Marking a reply as helpful or correct helps others with like issues when they try to search the site for assistance. I do not work for Tmobile and my suggestions and or opinions are my own**.~~~~ The site here is primarily peer to peer with some TMO moderation to keep the site in order..They do not have account access..The prefered method would be to contact TMO through either calling in (tier 1 support) or by contacting them through either Facebook/Twitter (tier 2 support)**~~~~
E

So why does customer support keep leading me to believe this is a “glitch” and a “fixable” thing. And that I should expect it to be remedied within 48 to 72 hours?

I wish I knew.  Support and Customer Care sometimes say things just to get people off of the phone without being more annoyed than when they called.  Your device showing as an unknown device does not restrict it in any way.  If the device is capable of using T-Mobile's implementation of it, it will work as long as the appropriate settings are correct. 

 

I have had multiple unlocked phones purchase elsewhere and used on T-Mobile where my account was able to identify the device and IMEI numbers. One device even got purchased internationally and had the details on my account. Yet some other devices, T-Mobile my account page recognized that it was a ‘Galaxy S10’ but nothing else about the phone or compatibility section. 

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