The Oppo-Smartphone offers the possibility to reject unknown callers automatically, meaning that if the phone number is not saved as a contact, the call is automatically rejected.

The function also offers as an exception, if the same caller within 3 minutes again, it is not blocked.

Android 10 | ColorOS 7.0
Step 1:  Open the  Phone -App
Step 2:  Open the  Menu
Step 3:  Tap on  Settings
Step 4:  Tap on  Set Rules
Step 5:  Tap on  Block calls
Step 6:  Enable or Disable  Block calls from private numbers
Step 7:  Confirm with  Turn on
  1. Open the Phone-App
  2. Open the Menu
  3. Tap on Settings
  4. Tap on Set Rules
  5. Tap on Block calls
  6. Enable or Disable Block calls from private numbers
  7. Confirm with Turn on

Oppo Instructions
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