How To make calls using Wi-Fi on the iPhone.

Creation date: 9/10/2021 2:28 PM    Updated: 10/11/2021 10:49 AM    calls iphone wi-fi
When your iPhone has a low cellular signal, use Wi-Fi Calling to make and receive calls through a Wi-Fi network.

https://support.apple.com/guide/iphone/make-calls-using-wi-fi-iph78f4697ca/ios