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When dialling a telephone number on the keypad, the dial key tones can be played if desired. By default, the key tones are deactivated when dialling on the Oppo-Smartphone. If you want the tones, you can activate them in the settings.

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  Dial pad tone
  1. Tap on Settings
  2. Tap on Sound & vibration
  3. Tap on More sounds & haptics
  4. Enable or disable Dial pad tone
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Oppo Instructions