In addition to saved contacts, phone numbers can also be blocked on the Samsung device, and if the phone number is included in the block list, all calls and messages (SMS) are automatically rejected.

Android 10 (One UI 2.0)
Step 1:  Open the  Phone-App
Step 2:  Open the  menu
Step 3:  Open the  Settings
Step 4:  Tap on  Block numbers
Step 5:  Tap on  Add phone number
Step 6:  Enter a  Phone number  an tap on  Add
  1. Open the Phone-App
  2. Open the menu
  3. Open the Settings
  4. Tap on Block numbers
  5. Tap on Add phone number
  6. Enter a Phone number an tap on Add

Samsung Instructions
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