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If a contact no longer wishes to receive calls and messages, he or she can be put on the blacklist, i.e. blocked.

Android 11 | ColorOS 11.0 | Google Contacts
Step 1: Tap on  Contacts
Step 2: Choose a  Contact
Step 3: Open the  Menu
Step 4: Tap on  Block numbers
Step 5: Tap on  Block
  1. Tap on Contacts
  2. Choose a Contact
  3. Open the Menu
  4. Tap on Block numbers
  5. Tap on Block
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