SMS Compliance and A2P 10DLC in the US

Learning the rules for SMS Compliance and A2P 10DLC for Effective Business Messaging

SMS compliance and A2P 10DLC are related concepts when it comes to sending text messages in the United States. They deal with the rules and regulations for sending text messages, especially for business or marketing purposes.

SMS compliance


SMS compliance refers to following the rules and regulations set by the Federal Communications Commission (FCC) and industry groups like the Cellular Telecommunications Industry Association (CTIA) in the United States. These organizations ensure that text messages are sent legally and ethically, safeguarding people from spam, fraud, and unwanted messages.

Key aspects of SMS compliance include:

  1. TCPA Compliance: The Telephone Consumer Protection Act (TCPA) sets the rules for sending automated text messages. It requires businesses to gain consent from the recipients they reach out to before sending marketing messages and to make sure opt-out requests are granted.
  2. CTIA Guidelines: Businesses sending SMS messages can refer to guidelines from the Cellular Telecommunications Industry Association (CTIA) that address best practices, message content, and other topics.
  3. Carrier Compliance: Different mobile providers may have their own compliance requirements and anti-spam measures.
  4. CAN-SPAM Act: The Controlling the Assault of Non-Solicited Pornography and Marketing (CAN-SPAM) Act, which primarily focuses on email, can also apply to SMS marketing.

    A2P 10DLC


    A2P 10DLC, which stands for Application-to-Person 10-Digit Long Code, is a system developed to improve the use of 10 digit long codes for Application-to-Person messaging. Long codes are regular phone numbers used for talking to each other, and A2P refers to business messages sent from applications to individuals. The growing use of long codes for SMS marketing and application messaging, which previously had problems with spam and compliance, prompted the creation of the A2P 10DLC.

    The key components of A2P 10DLC include:

    1. Registration: Businesses are required to register their long codes and provide information about how they plan to use them. The registration process for using A2P 10DLC may vary depending on your location and the service provider you have. Your SMS marketing system or messaging service provider can often guide you through the registration process for A2P 10DLC.
    2. Throughput and Rate Limiting: Carriers may limit the number of messages that can be sent per second and enforce rate limits to prevent continued abuse.
    3. Message Content Scanning: Messages are often scanned for compliance with regulations and guidelines while also checking for anti-spam measures.
    4. Opt-In and Opt-Out: Businesses must ensure they have explicit consent (opt-in) from recipients, and they must provide a user friend way and easy way to opt-out.

      A2P 10DLC is meant to keep long code messaging trustworthy, prevent spam, and make sure the rules are followed.


      Compliance with SMS regulations, including A2P 10DLC, is crucial for businesses that use SMS as part of their marketing and communication strategies to avoid legal issues, maintain a positive reputation, and provide a better experience for their customers. It's important to stay updated on these regulations, as they may change over time.


      Following SMS rules like A2P 10DLC is very important for businesses that use text messages for marketing and talking to customers. Following the rules will keep you out of trouble, maintain a good reputation, and make your customers happy.