Protect Users With Fast, Reliable SMS 2-FA Authentication

Deliver verification codes directly to mobile phones without requiring users to install a separate authenticator app.

✓ No Developer Needed     ✓ Integrate With Anything

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—   SMS Based 2FA

Add a Second Step Where Account Security Matters Most.

Give users a familiar verification experience while helping protect access to accounts and sensitive actions.

01New device logins

Send a verification code when a user signs in from a new device.

02Password resets

Use SMS verification to support password reset flows.

03Sensitive transactions

Confirm sensitive transactions with an additional verification step.

—   Secure SMS MFA

Help Protect Access Without Adding Friction For Users.

For businesses and enterprises handling sensitive customer data and employee access, implementing SMS-based two-factor authentication protects against account takeovers, supports compliance requirements and builds trust without disrupting user experience.

User-friendlyWorks through standard SMS without requiring a separate authenticator app.
Reliable deliveryUse an international, high-availability delivery network.
ScalableSupport changing business and user-volume needs.

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    Integrate a Powerful SMS API into Your Application

    The SMS API provides flexibility for building SMS-based two-step authentication into applications. Our language-agnostic APIs supports HTTPS and SMTP with examples in Node.js, Python and PHP. Build a new revenue stream with our ongoing revenue share program for software developers.
    Explore our SMS Gateway API solutions for authentication integration and access to comprehensive guides and responsive technical support.

    Enterprise-Grade Security Built Into Our Platform

    CompleteSMS uses official carrier-vetted Application-to-Person channels to transmit codes, ensuring authentication messages don’t end up in the spam folder. The platform can configure your account to automatically authenticate SMS requests based on email address and IP address. Using 2-FA SMS as an out-of-band authenticator aligns with the multi-factor principles outlined in federal guidelines, making our solution a reliable component for your company’s security strategy.


    Secure Your Logins With Multi-step Authentication SMS

    Adding SMS-based two-factor authentication to your login process blocks
    unauthorized access even when passwords are compromised. Schedule a demo
    to see how quickly you can deploy text message verification across your
    organization, or contact our team to discuss your specific
    authentication requirements.


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