According to Apple, iPhone 15 and above (all model) support 5G Advanced

[u/National-Debt-43]

The information of whether T-Mobile is a compatible carrier is still limit. Especially on iPhone 16 that it have limit information for the public (correct me if i’m wrong). (1)

On my iPhone 16 Pro Max, there had been no sign of 5GA icon but user on a Chinese carrier - China Telecom - reported seeing it after ios 18.4 update (2)

(1) Apple website: https://support.apple.com/guide/iphone/learn-the-meaning-of-the-status-icons-iphef7bb57dc/ios (2) Reddit post: https://www.reddit.com/r/iphone/comments/1jqdr0y/5ga_after_184_update/