The study found there were up to eight different attacks that could then be used to exploit phone number recycling, including personal identifiable information indexing (the use of people search services and phone numbers to gather additional personal information), phishing attacks, denial of service attacks, and account takeovers with or without authorized password reset. Researchers found that hackers don’t even have to exploit software vulnerabilities, they simply have to peruse mobile carrier prepaid websites to go shopping for a phone number they’re hoping to target.

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