Samsung Galaxy S21 Ultra
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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 and select 4G (LTE) as network mode. You can also visit the EE web page for more information about Wi-Fi calling.
Press the phone icon.
Press the menu icon.
Press Settings.
Press .
Press the indicator next to the required SIM to turn the function on or off.
Press the Home key to return to the home screen.