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By default, the Oppo phone vibrates for incoming calls, but if vibration is not desired, it can be disabled in the sound and vibration settings.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  Sound & vibration
Step 3: Enable or disable  Vibrate on ring
  1. Tap on Settings
  2. Tap on Sound & vibration
  3. Enable or disable Vibrate on ring
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Oppo Instructions