Yes @1BadRobot that model of phone has been added.
From > Vodafone Calling Over Wifi.
"To take advantage of Wi-Fi Calling, you need:
A Pay monthly Red Extra or Red Entertainment plan, a Red or Red Value Bundle, Red+, Business Value, Business Extra, Business Premier or Business Black
A compatible device:
iPhone 7, iPhone 7 Plus, iPhone 6s, iPhone 6s Plus or iPhone SE
Samsung Galaxy A3 (2016 and 2017), A5 (2016 and 2017), S6, S6 edge, S7, S7 edge, S8, S8+, or XCover 4
"
Current Phone >
Samsung Galaxy s²³ Ultra 512gb Phantom Black.
