Recycled Phone Numbers: The Hidden Risk Undermining SMS Authentication — and How Dynamic Ownership Scoring Stops It

Recycled phone numbers pose a growing identity-fraud risk for buy now, pay later providers and other digital services that treat SMS codes and phone possession as proof of identity, since roughly 35 million U.S. numbers are reassigned annually and may remain connected to former owners’ accounts. Attackers can obtain recently reassigned numbers, use them to receive password-reset or multi-factor authentication codes, and exploit other weaknesses such as SIM swaps, porting, or session replay before victims update their account details. The passage argues that conventional checks based on number tenure, carrier history, and active status cannot reliably detect changes in current ownership, while email-only alternatives may create added user friction. It presents Socure’s Dynamic Ownership Scoring and Five-Tier Framework as a real-time, data-driven approach that combines ownership, device, carrier, network, and behavioral signals to apply authentication measures according to risk, claiming this can preserve low-friction experiences for legitimate users while reducing recycled-number account takeovers across financial services, e-commerce, marketplaces, and digital payments.

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