A recycled phone number is a silent backdoor into your accounts. Learn how a stranger can take over your texts, emails, and password resets with nothing but a SIM card, and how to protect yourself before it's too late. Chapters: 00:00 Your old number is a backdoor 00:15 Numbers get recycled 00:31 The quiet clock 00:47 A lottery you didn't enter 01:02 The database gap 01:18 Reassignment Timeline 01:34 The Real Danger 01:50 SMS: No Encryption 02:01 Coinbase: 95% of Takeovers via SMS 02:14 Princeton's 259 Numbers 02:30 259 Numbers, Real Risk 02:45 You Can Stop It 03:01 First, the new owner types the old number into a 03:14 You're Locked Out 03:29 The Cost of Account Takeover 03:43 Widespread Impact 03:56 The 10-Minute Pre-Port Checklist 04:12 Switch to TOTP 04:28 Do It Now 04:39 The One Setting 04:53 The Fix 05:07 The 35 Million Lottery 05:23 SMS: The Weakest Link 05:39 Industry-Wide Problem 05:54 The Cost of Takeover 06:10 Your Number, Just a Number 06:26 The 45-Day Countdown 06:42 The Billion-Dollar Toll 06:58 The Forgotten Backdoor Sources & further reading: ⢠Recycled Phone Numbers Fuel a Wave of 'Silent' Fraud ā https://www.prove.com/blog/recycled-phone-numbers ⢠Recycled Number Fraud & How Retired Lines Are Used in Account Takeovers ā https://www.iddataweb.com/recycled-number-fraud ⢠Security and Privacy Risks of Number Recycling at Mobile Carriers in the United States ā https://recyclednumbers.cs.princeton.edu ⢠Reassigned Numbers Database ā https://www.fcc.gov/reassigned-numbers-database ⢠Why SMS-Based MFA Is Vulnerable and What to Use Instead ā https://www.vectra.ai/blog/the-hidden-risks-of-sms-based-multi-factor-authentication ⢠SMS-based authentication: Why it's no longer enough for security ā https://www.authsignal.com/blog/articles/why-sms-based-authentication-is-no-longer-enough-for-secure-account-protection











