GoKawiilApple's iOS Voice Isolation feature can reduce background noise on iPhone calls
Apple's iOS includes a Voice Isolation mode, available on iPhone XR/XS and newer running iOS 16.4 or later, that uses machine learning to filter out background noise during phone calls. Users can activate it mid-call via Control Center's Phone Controls banner, selecting Voice Isolation or Automatic under the Mic Mode section. Other fixes for poor call quality include checking volume and speaker settings and moving to an area with stronger signal.