T-Mobile_Rules

https://raw.githubusercontent.com/xykt/T-Mobile-Wi-Fi-Calling-Rules/main/T-Mobile.yaml

or

https://cdn.jsdelivr.net/gh/xykt/T-Mobile-Wi-Fi-Calling-Rules@main/T-Mobile.yaml

CAUTION: THESE RULES ONLY APPLY TO USERS OUTSIDE MAINLAND CHINA. PLEASE DO NOT DOWNLOAD WITHIN CHINA MAINLAND.

Ref: Wi-Fi Calling on a corporate network