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If desired, we can enable a sound when the lock screen is locked or unlocked; by default, the sound of the lock screen is disabled on the Oppo smartphone.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  Sound & vibration
Step 3: Tap on  More sounds & haptics
Step 4: Enable or disable  Lock screen sound
  1. Tap on Settings
  2. Tap on Sound & vibration
  3. Tap on More sounds & haptics
  4. Enable or disable Lock screen sound
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Oppo Instructions
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