Real Carrier Phone Number for Coinbase Verification

Cryptocurrency exchanges have an acute problem that banks don't: Sybil attacks. In a Sybil attack, one person creates dozens or hundreds of accounts — typically to farm airdrops, bypass trading limits, or qualify for new-user bonuses. VoIP numbers are the enabling technology: they cost fractions of a cent each and can be generated at scale from any laptop.

To counter this, exchanges like Coinbase run phone carrier-lookup checks during account creation and verification. A VoIP number scores as "high risk" — not because it's inherently fraudulent, but because it's statistically associated with bulk account creation. A real carrier number, by contrast, has a genuine PSTN origin and cannot be mass-generated without a physical SIM card for each account.

ReverbSMS sources its numbers from licensed US carriers on genuine US carrier infrastructure — the same infrastructure that backs real mobile numbers. Coinbase's fraud-detection system sees a legitimate carrier number, not a shared virtual pool. Results can vary by exchange and by verification step, but carrier numbers pass where VoIP commonly fails.