Voice Isolation is a feature available on iPhones that prioritizes the sound of your voice during a phone call or FaceTime call and blocks out background noise to help make your voice more clearly heard. It is available on iPhones running iOS 15 or later, and you can turn it on during a call by swiping down from the top-right corner of the screen to open Control Center, tapping Mic Mode, and selecting Voice Isolation. Here are some additional details about Voice Isolation on iPhone:

• You can only turn on Voice Isolation during a call, and it is not a universal setting, so youll have to enable it in every app you use for calls.
• Voice Isolation is available on most iPhones, iPads, and Macs from the last few years as long as youre running iOS 15 or macOS Monterey.
• There is also a Wide Spectrum setting available on FaceTime calls that leaves all ambient noise completely unfiltered so that the person youre calling can hear everything around you and not just your voice.
• Voice Isolation works by aggressively processing the audio coming into your mic in order to remove background noise, and in the process of isolating the voice, Apple also seems to bring it closer, resulting in much less echo and room tone.
• Voice Isolation is not available in phone calls on iOS 15, but it is available on iOS 16.4 or later.