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By default, the volume keys are used to change the media volume, but alternatively, the Oppo smartphone keys can also be used to change the ringer volume.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  Sound & vibration
Step 3: Tap on  Volume button function
Step 4: Choose  Media volume  or  Ringtone volume
  1. Tap on Settings
  2. Tap on Sound & vibration
  3. Tap on Volume button function
  4. Choose Media volume or Ringtone volume
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Oppo Instructions