Phone Verification API

Secure, single-use voice or SMS verification codes add reliable security to your systems. As the leaders in voice and SMS verification, TeleSign helps you deliver personalized customer safety anywhere on the globe.

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Protect account access
Verify transactions
Prevent fake users

Phone Verification API

Secure, single-use voice or SMS verification codes add reliable security to your systems. As the leaders in voice and SMS verification, TeleSign helps you deliver personalized customer safety anywhere on the globe.

Get started

Phone Verification API

Secure, single-use voice or SMS verification codes add reliable security to your systems. As the leaders in voice and SMS verification, TeleSign helps you deliver personalized customer safety anywhere on the globe.

Get started

Trusted Security

Two-factor authentication is the foundation of fraud prevention and account security. Prevent fraudulent account creation and make sure that your digital community is safe, secure, and streamlined with easy to implement one-time passcodes and two-factor authentication.

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Global Coverage

Unmatched Global Coverage

Reach more customers with 120+ optimized points-of-presence and 700+ direct-to-carrier routes​.

Reliability

Exceptional Reliability

Optimal performance with higher successful delivery rates than any leading competitor.

Customer Service

5-Star Customer Service

Premium customer support to strengthen communication, reduce costs, and ensure seamless customer interaction.

Verification in Action

Our phone number verification API offers fast, easy, and flexible SMS and voice verification to deliver on even the most complex use cases. Get up and running fast with clear documentation, user-friendly developer tools, comprehensive data reports, and the white-glove customer service.

Verification Direct-To-Carrier Routes

High Quality, Direct-To-Carrier Routes

TeleSign’s direct access to hundreds of carriers and waterfall approach across different routes ensures exceptional delivery and conversion rates.

Verification OTP

Secure, Time-Based, One-Time Passcode (TOTP)

Block illegitimate accounts and verify users in real time with one-time SMS verification codes to authenticate identities and verify transactions.

Voice Traffic Monitoring

Traffic Monitoring

Automatically flag anomalies in traffic type and volume to help prevent and fraud malicious attacks.

Phone Numbers Global Coverage

Reliable Global Coverage

Our extensive reach provides the most coverage and best-in-class message delivery to users in 87 countries and territories to keep your users protected, wherever they are.

Verification Answering Machine

Answering Machine OTP Delivery Prevention

Automatic answering machine detection prevents your one-time passcodes from being accidently left on vulnerable voicemail systems.

verification callerID

Dynamic CallerID

Use your preferred caller IDs so your customers know who is calling.

Verification in Action

Our phone number verification API offers fast, easy, and flexible SMS and voice verification to deliver on even the most complex use cases. Get up and running fast with clear documentation, user-friendly developer tools, comprehensive data reports, and the white-glove customer service.

Trusted by Top Companies

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“Working with TeleSign allowed us to quickly and effectively integrate SMS text messaging into our application.”

Rob Bauman
Director, Partner Engagement & Operations
EA

“We needed a partner that could scale to support our ever-expanding global footprint. TeleSign delivered the scale we were looking for.”

Chuck Mortimore
VP, Product Management, Identity, and Security
Salesforce
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Talk To An Expert

Interested in learning about how TeleSign's identity and engagement solutions can prevent fraud while fostering secure and global growth for your business? Let's chat.