The phone app on the OnePlus smartphone can automatically block unknown numbers or callers without a unique caller ID from, for example, alleged competition partners, if desired.

Android 10 | OxygenOS 10.0
Step 1:  Open the  Phone app
Step 2:  Open the  menu
Step 3:  Open the  Settings
Step 4:  Tap on  Blocked numbers
Step 5:  Enable or disable  Unknown   (Block calls from unidentified callers)
  1. Open the Phone app
  2. Open the menu
  3. Open the Settings
  4. Tap on Blocked numbers
  5. Enable or disable Unknown (Block calls from unidentified callers)

OnePlus Instructions
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