Why is my wifi calling not working on my 521?

[Windows Central Question]

why is my wifi calling not working on my 521?

wifi is on, & shows connected signal, wifi preferred selected, but phone will not use for calls or text. I read that there was an answer on this forum a couple of years ago, but it seems to be gone now.

 

[RumoredNow]

Did you download the T-Mo WiFi calling App? Wi-Fi Calling | Windows Phone Apps+Games Store (United States)

It will only work on T-Mo service, of course.

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