The LG smartphone can automatically reject unknown callers, i.e. if the phone number (caller ID) is suppressed.

Android 9 | LG UX 9.0
Block Unknown Callers -  Open the  Phone -App
Block Unknown Callers -  Open the  Menu
Block Unknown Callers -  Tap on  Call settings
Block Unknown Callers -  Tap on  Call blocking & Decline with message
Block Unknown Callers -  Enable or Disable  Private numbers
  1. Open the Phone-App
  2. Open the Menu
  3. Tap on Call settings
  4. Tap on Call blocking & Decline with message
  5. Enable or Disable Private numbers

LG Instructions
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