How do I make WiFi calls?

Related questions

1. Does having WiFi calling on drain battery?
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4. Is WiFi calling safe?
5. Is WiFi calling safer than cellular?
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Tags

1. #android
2. #settings
3. #advanced
4. #network
5. #phone
6. #calling
7. #mobile
8. #generally
9. #networks
10. #where
11. #iphones
12. #under
13. #toggle
14. #cellular
15. #internet
16. #yours