Telesign
APIs for phone number verification, SMS delivery, and digital identity risk scoring to secure user accounts.
| What is it | APIs for phone number verification, SMS delivery, and digital identity risk scoring to secure user accounts. |
|---|---|
| Pricing | Paid |
| Free tier | Yes |
| Platform | API |
| API | Yes |
| Best for | verifying new user accounts via SMS, preventing fake account creation and fraud |
| Domain registered | 2004 |
Data updated Aug. 1, 2026
What does Telesign do?
Telesign provides a suite of APIs that help businesses verify their users and communicate with them securely. At its core, the tool lets you programmatically check if a phone number is real and active, send SMS messages for two-factor authentication or alerts, and analyze digital signals to assess the risk of a new account or transaction. It's essentially a backend service for developers to build secure onboarding, login, and communication flows into their apps and websites.
What makes Telesign stand out is its focus on continuous trust, not just a one-time check. Its 'Continuous Trust Authority' uses a massive dataset of mobile identity signals to provide a risk score for user actions. This means you can flag suspicious login attempts or fraudulent transactions even after a user is already in your system. The platform also offers global reach, with coverage for sending SMS and verifying numbers in over 230 countries, and features like number masking to protect user privacy during phone-based interactions.
This tool is built for developers and security teams at companies of any size that need to manage digital risk. It's particularly useful for online marketplaces, social platforms, banks, and travel sites that handle sensitive user data and financial transactions. Common use cases include preventing fake account creation during sign-up, stopping account takeover attempts at login, securing password resets with SMS codes, and sending reliable transactional notifications like booking confirmations or fraud alerts.
Key features
What makes it stand outWho is Telesign for?
Who benefits most from this toolPricing
Free tier available — start without a credit cardSMS
- 0.009 price per message
- Send and receive messages
Messaging API
- SMS
- MMS
- RCS
- Viber
Voice
- Make and receive calls
Trust & presence
Gallery
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