When your phone rings, Smart Call checks the incoming number against a global database of reported spam numbers. If the number is flagged as spam, your screen won’t just say "Unknown." It will display "Spam Call" or "Telemarketer" in big, red letters before you even pick up.
While effective, this is a blunt instrument. If your doctor’s office, a delivery driver, or a friend calling from a new phone tries to reach you, they will be blocked. Use this with caution. how to block unknown numbers on samsung