I have an unlocked S8 on the Vodafone network in the UK.
My Vodafone account is set up for wifi as I know that Vodafpne support this.
However, I am unable to find the option on my phone to enable the option. I have tried selecting phone>3 dots>settings> but wifi calling isnt there and tried settings>apps>3 dots>system apps>phone>settings etc etc but still no option to switch wifi calling on.
My software is up to date.