Oppo
Lock Screen Sound On/Off auf Oppo
Oppo ships with the lock screen sound turned off. Coloros treats this tone as a separate feature from ringtones, alerts and haptic feedback, which is why enabling one does not automatically enable the other.
To switch it on, open Settings ➔ Sound & vibration ➔ More sounds & haptics. Inside this menu you find the Lock screen sound option. Tap the toggle to enable or disable it.
Once enabled, the phone plays a short click every time the screen locks or unlocks, whether you press the power button or the display times out on its own. This gives audible confirmation without checking the display.
Turning it back off follows the same path. Some users prefer the sound off in quiet environments like meetings or libraries, since it plays at every lock and unlock regardless of ringer volume settings.
This setting is independent from notification sounds and Focus mode. Muting your phone through Focus or Do Not Disturb does not silence the lock screen click, since it is treated as a system sound rather than an alert.