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WiFi Calling is not available to select from the Vodafone menu.
It is setup on my account.
Xperia L4 is on the list of devices.
Ask the Vodafone Customer services agent to force the phone via sending an OTA configuration update that should provision your phone for Calling Over WiFi.
"Register for Vodafone Wi-Fi Calling
Text the word CALLING to 97888
This is a free text which will add the service to your account
You should receive the following confirmation text:
Thanks. We’ll add Wi-Fi Calling to your account in the next 24 hours and will let you know when you’re all set up.
If you’d like to discuss this with us, or if you have any other issues, you can find more info here or contact us
Once you receive the confirmation text, switch on Wi-Fi Calling in your settings
Go to Settings, scroll down and choose the Application icon
Choose Phone and scroll down until you see Wi-Fi Calling – select the box beside this option
A pop-up will appear asking you to confirm if you want to enable Wi-Fi Calling – tap OK"
Make sure Calling Over Wi-Fi is turned on in your myvodafone.
Calling Over Wi-Fi will only activate when there is no network connection. Test by activating Flight Mode on your phone.
Here is some further information I have that may help.
Current Phone > Samsung Note 20 Ultra 5G - SM9860 Snapdragon.
Samsung One Ui 3.1 / Android 11.
Thanks for the heads up, I have requested and awaiting confirmation.