Going from Google Searches the phone does support Calling Over Wi-Fi @mufcpeter
However your mobile network needs to enable this on your account and if relevant send out an OTA CONFIGURATION to set it up.
It's driven by your sim card.
🌈 Stay Safe & Stay Alert. 🌈
Daily Driver > Samsung Galaxy s²⁴ Ultra 512Gb ~ Titanium Black.
The advice I offer is my own and does not represent Samsung’s position.
I'm here to help. " This is the way. "
