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 10 (ColorOS 7.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Sound & vibration
Step 3:  Enable or Disable  Lock screen sound
  1. Open the Settings
  2. Tap on Sound & vibration
  3. Enable or Disable Lock screen sound

Oppo Instructions
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