SMS Verification for Binance & Crypto Exchanges (2026 Guide)
When an exchange asks for a phone number
Exchanges use SMS as a security layer at several points: completing signup, enabling withdrawals, confirming a large transaction, and authorising a login from a new device. Many exchanges won't let you finish registration until SMS two-factor is set up. When your region isn't covered by the exchange's own SMS reach, a supported-country number solves the delivery problem.
How to verify an exchange step by step
- Select the exchange. Choose Binance (or the exchange you need) from the CODASMS service list.
- Pick a supported country. Match a country the exchange lists as SMS-supported.
- Enter it in Security settings. Add the number under the exchange's SMS/2FA section and request a code.
- Receive the code. The SMS appears in your dashboard, usually within a minute.
- Retry free if needed. Cancel a flagged number for an automatic refund and try another.
Why free numbers get rejected on exchanges
Exchanges are among the strictest platforms on number quality, because a phone line is a fraud-prevention signal. Free VoIP and recycled pool numbers are refused at the carrier-lookup stage — the code is never sent. A fresh carrier-grade number clears the check and the code arrives normally.
Keep an authenticator too
SMS is a convenient second factor, but for an account holding funds, pair it with an authenticator app or passkey where the exchange supports it. The phone number handles delivery and recovery; the authenticator adds a stronger layer.
Why pay-per-code fits exchanges
If a number is briefly flagged, you're refunded and simply try another — failed attempts cost nothing. You only pay when the code actually lands.
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Get a numberFrequently asked questions
Do crypto exchanges require a phone number?
Most require SMS two-factor to complete signup, enable withdrawals, or confirm large transactions and new-device logins.
Why do withdrawals lock for 24 hours after I change my number?
It's a deliberate security delay. Most exchanges disable withdrawals and P2P for 24 hours after a phone-number change so a hijacked account can't move funds immediately.
Which country number works for Binance?
Use a country the exchange lists as SMS-supported. Coverage lists differ per exchange, so match one that's covered for your account.
Are free numbers safe for an exchange account?
No. Free VoIP and recycled numbers are usually rejected, and a shared number is a security risk for an account holding funds. Use a fresh, private number.
What if the exchange code doesn't arrive?
Cancel for an automatic refund and try another number. You only pay on delivery.