Introduced with iOS 15, the "Voice Isolation" (Sprachisolation) feature significantly improves iPhone call clarity by using machine learning to block ambient noise, according to a 2022 report. Accessible during active calls via the Control Center's "Mic Mode," this feature, compatible with iPhone XR/XS or newer, was initially restricted to VoIP apps like FaceTime before expanding to cellular calls. For more details, visit iPhoneIslam .