I have problems making WiFi Calls on my Apple iPhone SE (2020)
If you can't use WiFi Calling, there may be several causes of the problem.
Check if there's an update for the operator settings in ’About’ in your phone's settings.

If you can't use WiFi Calling, there may be several causes of the problem.
Check if there's an update for the operator settings in ’About’ in your phone's settings.