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
Block unidentified callers -  Open the  Phone app
Block unidentified callers -  Open the  menu
Block unidentified callers -  Open the  Settings
Block unidentified callers -  Tap on  Blocked numbers
Block unidentified callers -  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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