Go to Settings > Mobile > Mobile Data Options . If you see this screen, your device has 5G activated. If you can’t see this screen, contact your network provider to confirm that your plan supports 5G.
Read moreDo you automatically get 5G with T-Mobile?
Customers on a T-Mobile, Metro by T-Mobile, or Sprint rate plan get 5G access included in their unlimited plan at no extra cost —so you don’t have to pay more for 5G coverage.
Read moreDo I need to change my tmobile plan for 5G?
No need to change your plan .
Read more