Wi-Fi calling allows your iPhone to place and receive phone calls and text messages over a Wi-Fi network. If you have a weak cellular signal but a solid Wi-Fi signal, your iPhone can make calls and send texts via Wi-Fi.
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https://www.howtogeek.com/229216/how-to-enable-and-use-wi-fi-calling-on-an-iphone/?utm_source=dlvr.it&utm_medium=blogger