The Samsung device can automatically block unknown callers, including callers who suppress their phone number. If the function is activated, all calls for which the phone number is not visible are automatically rejected.

Android 10 (One UI 2.0)
Step 1:  Open the  Phone App
Step 2:  Open the  Menu
Step 3:  Tap on  Settings
Step 4:  Tap on  Block numbers
Step 5:  Enable or disable  Block unknown callers
  1. Open the Phone App
  2. Open the Menu
  3. Tap on Settings
  4. Tap on Block numbers
  5. Enable or disable Block unknown callers

Samsung Instructions
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