you can use CXCallDirectoryManager.sharedInstance.openSettings() from the app which will redirect the user to the iOS Settings app and Call Blocking & Identification settings.

I have implemented a workaround that improves this experience by formatting the amount used in accessibilityLabel without the separator. So I display 12.225,34 € in the app, but accessibilityLabel gets 12225,34 € and then the amount is read correctly by the VoiceOver