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Engage your customers globally with SMS APIs

Send and receive SMS messages to connect and drive meaningful customer engagement. Easily build a trusted message delivery option into your web and mobile device applications with Telesign’s powerful programmable messaging API.

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  • Interact globally
  • Enable real-time notifications/alerts
  • Provide reliable communications

Your one-stop solution for global messaging

Building a complete SMS messaging solution is quick and easy with Telesign. With our SMS gateway API, you can deliver text alerts, reminders, and notifications, facilitate two-way conversations, and communicate anonymously with your 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.

Messaging for every scale

Connect with your customers in more than 230 countries and territories across the world.

Flexible workflows

Accommodate the dynamic needs of your customers by maintaining a flexible business process.

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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.

Global reach and coverage

Reach 97% of the world's population across 230+ countries and 80+ languages with Telesign's SMS messaging API. Connect with your customers in over 230 countries with our turn-key geo-expansion.

Create a local experience

Build customer trust and establish a local presence by communicating with familiar, recognizable phone numbers. Purchase or lease phone numbers with geographically accurate area and country codes.

One-way communication

Engage your customers with timely and personalized SMS messages using Telesign's SMS API. From account alerts, to purchase notifications, and appointment reminders, our SMS API will keep your customers informed with an experience they can trust.

‍Two-way communication

Connect with your customers on their terms for true conversations. Personalize your support channels to build unique customer relationships using our secure, private, two-way communications to reach your customers quickly at any time.

Get started with just a few lines of code

Start messaging your customers today with our quick and easy-to-use SMS Service API and in-depth documentation.

curl --request POST \
	--url \
	--header 'accept: application/json' \
	--header 'content-type: application/x-www-form-urlencoded' \
	--data phone_number=15558675309 \
	--data 'message=Hello world!' \
	--data message_type=ARN

Powerful SMS messaging for your business in a single API

Our user-friendly global SMS API can easily be integrated into your communications platform, enabling you to quickly and easily send SMS text messages to your customers. We provide comprehensive documentation, developer tools, detailed analytics reports, and white-glove customer service.


Advanced phone number cleansing

Phone number cleansing can improve your message deliverability by more than 10%. Telesign helps you reduce operational costs by automatically formatting phone numbers based on message type and country of origin.

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Opt-out management

Receive SMS opt-out requests from customers and automatically register them in your system with a Telesign SenderID to maintain compliance and deliver exceptional customer service.

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Enable private communications

Guard personal phone numbers and protect identities by connecting with your customers anonymously via number masking.

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Engagement optimization and tracking

Simplify URLs into fewer characters to make links easier to send via SMS. Save valuable alphanumeric characters for calls-to-action and gain insight into end-user behavior with activity tracking of click-throughs and conversions.

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Compliance support

Stay compliant. Utilize free regulatory assistance to mitigate Telephone Consumer Protection Act (TCPA) risks and adhere to worldwide content compliance.

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Long message support

Separate SMS messages over 160 characters based on device type, mobile forms and operator requirements and sends to the user’s handset with instructions to reassemble the message back in the correct order as one SMS.


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

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Salesforce delivers mobile verification

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What is SMS API?

An SMS API is an application programming interface that allows software developers to integrate text messaging functionality into their own applications or systems. An SMS service API provides a way for developers to programmatically send and receive text messages, as well as manage aspects such as message templates, message delivery, and message reporting. By integrating Telesign’s SMS API into your applications or systems, developers can enable their users to receive alerts, notifications, and other messages via SMS, which can be a convenient and effective way of communicating important information.

What are some of the benefits of using the SMS API?

  • Increased reach: Can be delivered to virtually any mobile phone, regardless of the carrier.
  • Increased Engagement: Recieved messages are more likely to be read than emails and can prompt customers to take immediate action.
  • Increased ROI: Cost-effective way to reach customers and drive engagement.

How can SMS API be used?

Notifications & appointment reminders: Send SMS messages to notify of order statuses, delivery delays, upcoming appointments, and other important information. Marketing Campaigns: Send messages to customers as part of marketing campaigns. Employee Communications: Send messages to employees to notify them of shift changes, cancellations, and other valuable information.

What platforms are supported?

SMS API supports a variety of platforms including Android, iOS, Windows, and Mac.

Free tools and resources