Sony Xperia 1 VI
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It's not possible to use Wi-Fi calling
Solution 1 of 4: Wi-Fi calling is turned 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 SIMs.
Press the name of the SIM.
Press Wi-Fi Calling.
Press the indicator next to "Use Wi-Fi calling" to turn the function on or off.
Press the Home key to return to the home screen.