If you send business text messages from a 10-digit local phone number, you will need to complete the A2P 10DLC registration to keep messaging active and deliverable. Use the links throughout this article to access step-by-step setup instructions, best practices and troubleshooting resources!

A2P 10DLC (Application-to-Person 10-digit long code) is the US carrier registration required for businesses to send text messages to customers using standard 10-digit local numbers. Registration ties your messaging activity to a verified Brand (your business identity) and one or more Campaigns (how you plan to message), which helps carriers evaluate trust and reduce spam.

While you submit the details through HighLevel, the actual review and approval process is handled by US phone carriers and their registration partners. Carriers decide whether a Brand or Campaign meets requirements and if the registration is accepted or rejected.

In HighLevel, A2P 10DLC registration is managed through Trust Center. Trust Center provides a guided workflow for creating and managing Business Profiles, Brands, Campaigns, consent information, and registration submissions from a single location.

A2P 10DLC registration is required if your business sends text messages to US recipients using 10-digit long code numbers. This includes messages such as appointment reminders, promotional messages, or customer support communications.

If you send messages to US recipients (including from Canadian numbers), A2P registration is required. If you do not send messages to recipients in the United States or Canada using long code numbers, you may not need A2P 10DLC registration.

A2P 10DLC registration is built around two required components: Brands and Campaigns. Businesses must identify who they are to the carrier networks (Brand registration) and register what type of messages they send (Campaign registration).

After Brand and Campaign approval, it can take up to 3 business days or longer for all carriers to receive registration information. This is normal as carriers receive your registered information. If the issue persists beyond 4 business days, contact HighLevel Support.

Before beginning registration, gather all required business information. Requirements differ based on whether you register as a Standard Brand or Sole Proprietor Brand.

Standard Brand Requirements

Standard Brand registration requires the following business information:

• Business Name
• Physical Address (Street, City, State/Province/Region, Postal Code, Country)
• Business Identity (Direct Customer or ISV/Reseller/Partner)
• Business Type (Sole Proprietorship/Partnership/Corporation/Co-Operative/LLC/Non-Profit)
• Company Status (Private/Public)
• Stock Ticker & Exchange (if Public)
• Business Registration Number & Type (EIN for US-based companies, other business identifiers for non-US companies)
• Industry
• Website
• Regions of Operations
• Points of Contact

Sole Proprietor Requirements

Sole Proprietor registration requires the following information:

• Brand or business name
• First name
• Last name
• Email address
• Mobile phone number (in US or Canada)
• Physical address (in US or Canada)

A Brand is the verified business identity behind your messaging. Carriers use Brand details to confirm that a real, legitimate business is responsible for the messages being sent. A2P 10DLC registration has different Brand registration paths depending on your business type. Selecting the correct path upfront helps avoid delays and rejections.

To learn more about brand registration and how to select the correct brand type, see: Registering Your A2P Brand.

Campaign registration connects your approved Brand to a specific messaging purpose. Carriers review Campaign details to understand what type of messages you plan to send (for example, appointment reminders, account notifications, or marketing) and whether your opt-in language and sample messages align with that purpose.

To learn more about campaign registration, see: A2P Campaign Registration.

Campaign Use Cases

Use cases describe the type of messaging a Campaign will send. Selecting the correct use case matters because carriers approve (or reject) Campaigns based on whether your messaging content, opt-in flow, and stated intent match the use case requirements. Use cases vary from notifications and fraud alerts to customer care to social updates.

Some companies may only need to register one campaign use case. In other scenarios, you may have multiple. For example, if you send authentication codes to validate new users but also send marketing messages, you should register two campaign use cases.

Forbidden Messaging Categories

Some business use cases and messaging content is prohibited. Businesses submitting a registration for prohibited categories will not be approved. Businesses sending SMS/MMS messages with prohibited content, regardless of approved campaign status, may result in the revoking of approved campaigns, carrier fines, and other penalties.

HighLevel has no part in the vetting or approval process after submission. However, the platform provides guidance to help you submit detailed and accurate information to ensure a smooth review process.

A2P 10DLC includes fees for registration and for sending messages. Planning for both the submission fees and ongoing carrier-related charges helps avoid surprises once your numbers are in use.

• Registering Your A2P Brand
• A2P Campaign Registration: Step by Step Guide and FAQs
• A2P 10DLC Campaign Use Cases
• Forbidden Message Categories for SMS and MMS in the US and Canada 
• Pricing and Fees for the A2P 10DLC Service
• A2P 10DLC Campaign Approval Best Practices
• Toll-Free Number Verification Guide for LC - Phone (US/Canada)