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S21 ultra


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My s21 ultra model SM-G998B/DS can't use 5g 


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Userlevel 6
Badge +14

Please make sure the Network Settings are turned on to use 5G. You should also check out our Signal issues / no service troubleshooting page for helpful steps and a link to our coverage map to make sure you’re in a 5G area.

Userlevel 7
Badge +14

Make sure your APN settings are correct.  BYOD T-Mobile data & APN settings | T-Mobile Support

With BYOD devices, they need to be compatible with T-Mobile’s network to work, especially on 5G.  After looking up the 5G N-bands supported by your device, it is not compatible with T-Mobile’s 5G deployment.  Samsung Galaxy S21 Ultra 5G Exynos - Specifications (devicespecifications.com)

Userlevel 5
Badge +8

also which sim card is in it? should have came with the correct one but might as well double check anyways.

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