Wifi calling suddenly disabled and unusable on my Galaxy S7

[Android Central Question]

I bought an unlocked Galaxy S7 made for AT&T but I use it on T-Mobile. I live in an area with notoriously poor T-Mobile coverage but I have been using wifi and wifi calling for months without problems. Suddenly, about a week or so ago, I lost the ability to use wifi calling. When I go to settings>connections, the option to turn on and off wifi calling is completely greyed out and does nothing when I click on it. I read in other threads this happens when I use a different carrier but it worked just fine previously. I don't think I have had any updates recently so I'm not sure what caused it to stop working suddenly.

 

[belodion]

Have you spoken to your carrier about it?
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