Wi-Fi Calling is a feature that lets an iPhone effectively re-route mobile calls over the Wi-Fi network to which you’re connected—if it has the right qualities instead of using the cellular
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Wi-Fi Calling Not Working On iPhone? Here's The Fix.
How to use AT&T wifi calling on an unlocked phone? | AT&T Jul 24, 2017 What is Wi-Fi Calling? - FAQs Wi-Fi Calling lets you make and receive voice and video calls over a Wi-Fi connection instead of using your cellular connection. If you have a Wi-Fi connection and are in an area where voice service is weak or unavailable, use Wi-Fi calling to continue making voice calls. Wi-Fi calling is included at no additional charge on compatible devices.
What is Wi-Fi calling: Everything you need to know FAQ - CNET