Most people think of facetime as a video chat service, but it also supports audio calls that operate like regular telephone calls. The steps below show you how The latter requires a little more attention to create, but you might find it a better alternative to a voice call, with crisper.
FaceTime Help & Tips - How to Fix Your Problems - AppleToolBox
In fact, you can change the audio and video settings in the facetime app at any time during a call
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