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A sound is heard when locking or unlocking the screen lock in Android. This is enabled by factory, but can be disabled in the sound and vibration settings.

Android 12
Step 1: Tap on  Settings
Step 2: Tap on  Sound and vibration
Step 3: Enable or disable  Screen locking sound
  1. Tap on Settings
  2. Tap on Sound and vibration
  3. Enable or disable Screen locking sound
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