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 10 (ColorOS 7.0)
Step 1:  Open the  Settings
Step 2:  Tap on  Sound & vibration
Step 3:  Enable or Disable  Vibrate for incoming calls
  1. Open the Settings
  2. Tap on Sound & vibration
  3. Enable or Disable Vibrate for incoming calls

Oppo Instructions
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