I have to disagree with the T-Mobile branding theory. I switched from Metro by T-Mobile. I had 5G UC on my 256GB Factory unlocked S22 Ultra. This is something on T-Mobile's side. The speeds and coverage are not the same. I've tested the service with iPhone 13 Pro Max, Pixel 6 Pro. The S22 Ultra is the only phone that doesn't access the UC. I've verified the APN settings. Tech support couldn't figure it out.
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