Phone users across the United States are experiencing a surge in silent voicemail scams, where spam messages appear in voicemail inboxes without the phone ever ringing. The tactic, known as ringless voicemail spam, uses automated robocall systems and caller ID spoofing to bypass traditional call screening. Victims see voicemail notifications from unknown or international numbers that cycle rapidly, making individual blocking ineffective.
The scam operates by exploiting voicemail systems directly, depositing messages without triggering the phone's ringer. Scammers use caller ID spoofing software to falsify displayed numbers and rotate through large batches of phone numbers to evade spam filters. Many spoofed numbers are randomly generated or belong to real people whose caller ID information is being misused without their knowledge. The primary goal is to confirm that a phone number is active and monitored.
When recipients call back out of curiosity, they may reach premium-rate phone lines that charge per minute, encounter phishing attempts requesting personal information, or connect to automated systems designed to extract data. Even without calling back, the presence of the voicemail confirms the number is in use, making it more valuable for future scam campaigns. The Federal Trade Commission specifically advises against returning calls to unknown numbers, as engagement signals to scammers that the number is worth targeting.
The impact extends beyond individual annoyance, as confirmed active numbers are shared across spam networks and sold to other scammers. Traditional call blocking proves largely ineffective because scammers continuously rotate through new numbers. Carrier-level voicemail systems, rather than phone operating systems, control message delivery, allowing these spam voicemails to bypass device-level protections in many cases.
Security experts recommend enabling built-in spam filtering features on iOS and Android devices, including options to silence unknown callers or screen calls with AI before they ring. Third-party call-blocking applications can identify patterns and known scam numbers more effectively than manual blocking. Users should report incidents to the FTC at reportfraud.ftc.gov and consider data removal services to reduce their phone number's exposure on marketing lists and data broker sites that scammers frequently access.
Source: https://www.foxnews.com/tech/missed-voicemails-calls-could-scam