How can I tell if wi-fi calling is really working? I have it enabled and it let me update my emergency address. I rebooted my phone. In the top left corner it just says "XFINITY Mobile"
One way to test/force it,
After enabling Wifi calling. If you "Switch on" Airplane mode and enable wifi alone you will see top left corner XM WiFi.
You can make and receive calls when you are in WiFi.