When you answer or end a call, the Oppo smartphone vibrates by default, but you can deactivate the vibration in the phone settings.

Android 10 (ColorOS 7.0)
Step 1:  Open the  Phone -App
Step 2:  Open the  Menu
Step 3:  Tap on  Settings
Step 4:  Enable or Disable  Vibrate When Call is Answered/Ended
  1. Open the Phone-App
  2. Open the Menu
  3. Tap on Settings
  4. Enable or Disable Vibrate When Call is Answered/Ended

Oppo Instructions
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