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

Android 10 (ColorOS 7.0)
Step 1:  Open the  Contacts -App
Step 2:  Tap on  Contact  you want
Step 3:  Open the  Menu
Step 4:  Tap on  Add to Blacklist
Step 5:  Confirm with  Add to Blacklist
  1. Open the Contacts-App
  2. Tap on Contact you want
  3. Open the Menu
  4. Tap on Add to Blacklist
  5. Confirm with Add to Blacklist

Oppo Instructions
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