Hi lmt607,
Good day.
Have you turned on the " WiFi- calling" in settings? (settings> connections>call> Wifi calling?
If your firmware is currently on WW-v16.0611.1901.1, please kindly text me your serial number by PM.
( settings> system > about phone > status > serial number)
Please also kindly tell me your SIM carrier. Thank you 🙂