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Help T-Mobile using StraightTalk - Can I make calls over Wifi?

I have a Samsung Galaxy S5 that was originally purchased thru T-Mobile and I had T-Mobile service for a while. With T-Mobile, I was able to make calls over Wifi.

Now, I have switched to Straight Talk. It all works fine but inside my home the signal ranges from very weak to non-existant. How can I set my phone up to make calls over Wifi when I am subscribed thru Straight Talk?
 
I don't think you can do it. The special software that enables WiFi calling is hard-coded to work only with T-Mobile service. I think it will work on Metro PCS too. But even if your Straight Talk service is running on the T-Mobile network, I'd betcha it's a no-go because you don't have T-Mobile *service*.
 
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