Silent Robocalls Verify Active Phone Numbers For Scams
Cybersecurity experts warn that silent or delayed calls are deliberate reconnaissance by fraudsters to verify active phone numbers, according to Keeper Security CISO Shane Barney. Predictive-dialing systems and automated campaigns confirm reachable numbers that can feed phishing, SIM-swap, or voice-cloning attacks. Experts advise hanging up, answering without speaking, using spam-filtering apps like Truecaller, RoboKiller, and Hiya, and strengthening account security.
Key Points
- 1Use silent automated calls to confirm active phone numbers across large-scale dialing campaigns
- 2Enable fraudsters to filter reachable targets cheaply and sell validated contacts in crime markets
- 3Advise immediate hang-ups, use spam filters, and secure accounts to mitigate follow-up scams
Scoring Rationale
High practical relevance and credible expert sourcing drove the score, while limited novelty and common scam mechanics constrain impact.
Sources
Public references used for this report.
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