How to enable and use Wi-Fi calling on your Android or iPhone to make calls without cellular service

You can use Wi-Fi calling on your Android or iPhone to make calls using Wi-Fi rather than your cellular network.
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How to use Wi-Fi calling during a service outage

Thousands of AT&T cellular customers were unable to place calls, texts or access the internet during a nationwide network outage Thursday. During the outage, AT&T urged its customers to connect to ...