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Two-Factor Authentication | SignalWire

Validating what users have.

While passwords are useful to verify what users “know,” voice and text verifications help to validate what users “have.” Our APIs and infrastructure make it easy to use voice and text for two-factor authentication (2FA).

Added Security

Your application’s security can be compromised when your users re-use passwords from other sites that get hacked or during phishing attacks designed to steal your users’ credentials. Adding two-factor authentication is an important step towards protecting your users’ data when their credentials have been compromised.

User Friendly

Unlike other two factor authentication methods including hardware tokens or authenticator apps, SMS and voice login verification only require a valid phone number, which you can collect and verify during user signup.

Developer Approved

Our APIs enable you to interact with users via SMS or voice. The voice interaction includes the appropriate text-to-speech, DMTF (touchtone) and speech-to-text algorithms to enable you interact with your users as you desire.

Cost Effective

The evolving threat environment has put security budgets under strain. Our low prices for both SMS and voice have prompted many application developers to implement their two-factor authentication with SignalWire.

Build with the best.

Add voice or SMS verification to any app fast on a platform designed by the original geeks of software-defined telecom.

  • Easy-to-use and advanced APIs
  • Backward compatible with Twilio XML and SDKs
  • Short code and local numbers
  • Expert developer and community support
  • Disruptive pricing

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