Is free Wi-Fi calling ending?

I'm really confused about Wi-Fi calling apps. I tried reptel the other day, they say they are free but at the last minute they tell you it is only free for other reptel users. Is there any iphone apps that keep Wi-Fi calling truly free? Also is there any windows apps that keep Wi-Fi calling truly free? Meaning I can call anyone at anytime as long as I have Wi-Fi?

Fongo

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