Skip to content

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.

Try for free Talk to sales
  • 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.

Clients who use this product
affirm logo

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.

Whatsapp boarding pass message on the phone

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-icon icon

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.

search-idea icon

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

search-magnifier icon

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 icon

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-cleasing icon

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 icon

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 is a crucial component of two-way verification to improve the security of user accounts. This process sends a code to a user’s mobile phone when relevant – usually when they log in to their account or want to change their password. The user must input the received code before the login or password change will occur.

Why is SMS verification used?

It provides a private channel between the user and the company to exchange two-way authentication codes. Since only the user’s mobile phone can access these codes, it’s often used to confirm a user’s identity and to protect them from fraud.

How does SMS verification work?

The platform asks users to enter their mobile phone number when they sign up for a new account—the user keys in the code to finalize their first login attempt. Authentication will continue during future logins, when signing in from new devices, completing account detail changes, and more.

What are the benefits of SMS verification?

The primary advantage is additional security for client accounts. However, it provides other benefits, such as helping prevent fake account creation and fraud, confirming user identity, and verifying the legitimacy of messages and emails.