On stock Android, InCallUI is part of the Google Phone app ( com.google.android.dialer ). It features a minimalist design, typically with a large "Answer" slider and circular buttons for mute/speaker.
Next time you mute a conference line or switch to speakerphone, remember: you are interacting with one of Android’s oldest, most patched, and most resilient system UIs. android incallui
Working with the device's hardware to turn off the screen when you hold the phone to your ear to prevent accidental touches. OEM Customizations On stock Android, InCallUI is part of the
Displaying the buttons for mute, keypad, speaker, hold, and adding calls. On stock Android
While Google’s AOSP InCallUI is clean and functional, Samsung, Xiaomi, and Oppo replace it entirely.