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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 11 | One UI 3.0
Step 1: Tap on  Phone
Step 2: Open the  Menu
Step 3: Tap on  Settings
Step 4: Tap on  Block numbers
Step 5: Choose  Recents ,  Contacts  or  Add phone number
Step 6: Enter a  Phone number  and tap  Add
  1. Tap on Phone
  2. Open the Menu
  3. Tap on Settings
  4. Tap on Block numbers
  5. Choose Recents, Contacts or Add phone number
  6. Enter a Phone number and tap Add
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Samsung Instructions