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SMS Verify

Secure SMS verification on a global scale

Secure, single-use SMS verification codes add reliable protection to your business and customers. Deliver phone-based verification and MFA using a time-based, one-time passcodes (OTPs) sent via SMS.

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  • Protect account access 
  • Verify transactions
  • Prevent fake users

Security you can count on

Multifactor authentication (MFA) is the foundation of fraud prevention and account security. Make sure your customers and your platform are safe, secure, and streamlined with easy to implement one-time passcodes (OTPs) and MFA.

Reduce fraud

Validate and authenticate legitimate users and prevent fraud—from sign-up to log out.

Verify everyone, everywhere

Protect customers no matter where in the world they’re located​.

Reliability you can trust

Confidently reach customers with unparalleled speed and accuracy using 700+ direct-to-carrier network operator routes.

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Safeguard your customer accounts

Prevent fraud and keep your customers and business secure. From new account sign-ups to customer sign-ins, enable MFA for critical interactions. Go one-step further and catch account takeover risks with SIM Swap and call forwarding detection and prevent communication fraud with IRSF intelligence.

RCS customer care support

Unmatched global coverage‍

Verify just about everyone. Telesign’s verification API reaches 97% of the world’s population. Authenticate your customers across 230 countries and over 80 languages. Effortlessly grow and scale your business with turn-key geo-expansion.

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Smart, high-quality routing

Speed and reliability matter. Telesign’s text messaging API intelligently routes your messages using the most efficient path available to provide you with the fastest and most reliable delivery possible. Be confident that your outbound messages are delivered at the speed of business.

‍Omnichannel waterfall delivery for endless redundancy

Rely on best-in-class deliverability rates. Our reliable API deploys a waterfall approach with dynamic routing to ensure every message is delivered. If any message fails, it instantly redirects the communication to a new carrier route or fallsback to a different channel.

Secure your platform with a few lines of code

Our easy-to-use messaging API and in-depth documentation makes it quick and easy to start messaging your customers.

curl --request POST \
     --url \
     --header 'accept: application/json' \
     --header 'content-type: application/x-www-form-urlencoded' \
     --data phone_number=15558675309

SMS Verification you and your customers will trust


Waterfall approach

Send SMS verification codes across multiple channels and languages for greater flexibility. Telesign’s direct access to hundreds of carriers and waterfall approach across different routes ensures exceptional delivery rates with minimal latency.


Number insights

Leverage phone number data intelligence to strengthen user verification, reduce fake accounts, inform risk models and improve conversions and accuracy of collected information


Traffic monitoring

Traffic monitoring automatically flags traffic type and volume anomalies to prevent communication fraud and malicious attacks. Adjust and split traffic based on type of traffic across multiple route providers, to swiftly reduce message fail rates.


SIM swap detection

Confirm SIM swap status to block or allow SMS verification. Leverage Telesign's network of SIM swap coverage in 16 countries and more than 40 MNOs directly integrated into solutions.


Phone number cleansing

Don't let international dialing rules negatively impact your delivery rate! SMS Verify automatically cleanses phone numbers by adding or removing leading digits in the phone numbers based on country, city and message type.


IRSF detection

Detect and minimize financial losses from International Revenue Share Fraud (IRSF). Telesign’s risk assessment model layers into your verification work flows and blocks messages to fraudulent numbers and spam.


What is SMS verification?

SMS verification confirms a user’s identity by asking them to input a code that has been sent to their mobile phone.

Why is SMS verification used?

SMS verification is used to confirm a user’s identity and to protect from fraud.

How does SMS verification work?

When a user signs up for a new account, they are asked to input their mobile phone number. A code is then sent to the user’s mobile phone, and they are asked upon registration and future log in attempts to confirm identity.

What are the benefits of SMS verification?

  • Helps to prevent fraud and confirms a user’s identity
  • Adds an extra layer of security to your account
  • Verifies the authenticity of messages and emails
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