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Alternative telephone apps can be installed and used on the Oppo smartphone for making calls, but to ensure that the right app is called up when a call comes in, it must be defined as the default app.

Android 11 | ColorOS 11.0
Step 1: Tap on  Settings
Step 2: Tap on  App management
Step 3: Tap on  Default apps
Step 4: Tap on  Phone app
Step 5: Set the  Default phone app
  1. Tap on Settings
  2. Tap on App management
  3. Tap on Default apps
  4. Tap on Phone app
  5. Set the Default phone app
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Oppo Instructions