1. Find "Wi-Fi Calling"
Press Settings.
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Press Apps.
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Press Phone.
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Press Wi-Fi Calling.
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2. Turn Wi-Fi calling on or off
Press the indicator next to "Wi-Fi Calling on This iPhone" to turn the function on or off.
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If you turn on the function, press Enable.
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3. Return to the home screen
Press the Home key to return to the home screen.
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