Have a Samsung S20 FE 5G on Vodafone (UK) with WiFi Calling enabled at network provider end but no option is showing up for me to enable it on phone. I have tried all the guides I can find online but no matter where I look the option is not there. I have reset network settings, turned it off and on again at network end and done same with phone. I'm losing the will to live with these now. Please someone help.