Phone Number Verification
Overview
Phone number verification ensures a number is valid, reachable, and under the customer’s control. Methods include OTP over SMS/voice, flash/“silent” verification via carrier APIs, and HLR/CNAM/porting checks. It underpins 2FA, prevents fake account creation, and improves deliverability for alerts/notifications. Because SMS can be intercepted (SIM swap, call-forwarding fraud), high-risk flows should combine phone verification with stronger factors (app-based prompts, biometrics, passkeys). Compliance programs log consent, minimize PII, and consider telecom regulations in relevant jurisdictions. Monitoring number reputation and velocity (new SIMs, rapid reassignments) reduces fraud and friction.
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