How to enable voice isolation to improve call quality on iPhone

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How to improve sound quality on iPhone calls

How to enable voice isolation to improve call quality on iPhone

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How to improve sound quality on iPhone calls

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Not so well known feature greatly improves phone calls made on the iPhone - PhoneArena

Use Your iPhone's Hidden Microphone Effects to Improve Your Audio in FaceTime, Zoom, and Other Video Calling Apps « iOS & iPhone :: Gadget Hacks