Why scammers call you and say nothing - and how to respond safely

**Executive summary:** This article explains that silent or delayed-response phone calls are frequently automated reconnaissance used by scammers to confirm active numbers; attackers use predictive dialing and voice-detection to filter targets and then sell or reuse validated numbers for phishing, SIM-swap, or other fraud. It recommends hanging up, avoiding speaking, and using built-in or third-party spam call filtering to reduce risk.