How to turn on and off Wi-Fi calling on iOS 8

[iMore.com]

Wi-Fi calling is a new feature of iOS 8 that's available initially to T-Mobile customers in the United States and EE customers in the U.K. What's more, it's coming to other carriers in the coming months. It lets your iPhone make and receive calls using Wi-Fi instead of depending on your carrier's cell tower coverage. Here's how it works.

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