Microsoft Surface Duo
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Turning Wi-Fi calling on or off
When Wi-Fi calling is turned on, you can make and answer calls using a Wi-Fi network when you're in an area with little or no network coverage. To turn on Wi-Fi calling, you need to establish a connection to a Wi-Fi network, select 4G (LTE) as network mode and follow the steps below. You can also visit the EE web page for more information about Wi-Fi calling.
Slide two fingers downwards starting from the top of the screen.
Press the settings icon.
Press Network and Internet.
Press Mobile network.
Press Wi-Fi Calling.
Press the indicator to turn the function on or off.
Slide your finger upwards starting from the bottom of the screen to return to the home screen.