One-time passcode and 2FA texts: best practices
How businesses should send verification codes by text: message format, expiry, security, registration and why marketing never belongs in an OTP message.
·2 min read
One-time passcodes, used for login verification and two-factor authentication, are a distinct kind of business text. People need them instantly, they must be secure, and they cannot be mixed with anything else.
If your app, portal or booking system sends codes, these practices keep them working.
Format the message clearly
Lead with the code and the business name, state how long it is valid, and warn that you will never ask for the code. Keep the message short and consistent so customers recognize it.
- ✓Your Acme Portal code is 482913. It expires in 10 minutes. We will never call or text to ask for it.
Security basics
Generate random codes, expire them quickly, allow only a few attempts, and rate-limit how often a number can request a code. Never include links in passcode messages, because phishing messages imitate them. For high-risk accounts, consider authenticator apps in addition to SMS.
Registration and separation
Register verification traffic under the appropriate two-factor or account notification use case rather than mixing it with marketing. Never add promotions to code messages; that is confusing, undermines trust and can break registration rules. Monitor delivery closely, because a failed code means a locked-out customer.
Key takeaways
- →Lead with the code, the business name and the expiry time.
- →Expire codes quickly and limit attempts.
- →No links or marketing in passcode texts.
- →Register verification traffic separately and monitor delivery.
Put this into practice with Text2Sale
Import leads, create follow-up campaigns, organize replies, and connect texting, calling, and appointments in one workspace.
Frequently asked questions
How long should a passcode be valid?
Usually five to ten minutes is enough for the user and limits the window for misuse.
Is SMS secure enough for 2FA?
It is much better than passwords alone, but sensitive systems should also offer authenticator apps or security keys.