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A2P (Application-to-Person) 10DLC registration is required for businesses that send text messages to contacts in the United States. Without registration, your SMS messages may be blocked or filtered as spam by carriers.
A2P 10DLC registration article

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Why this matters

US carriers require businesses to register their brand and campaign before sending SMS at scale. Registration improves deliverability, prevents your messages from being filtered as spam, and establishes a compliant communication channel with your audience.
All contacts must have opted in to receive texts or calls from your business before you send messages to them. This is a legal requirement for A2P messaging compliance and cannot be skipped.

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Prerequisites

Before starting, make sure your Business Profile is fully complete — especially your legal business name, EIN (Employer Identification Number), business address, and authorized representative details.

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How to complete A2P 10DLC registration

1

Verify your business profile

Go to Settings > Business Profile and confirm your legal business name, EIN, business type, address, and authorized representative are all filled in accurately.
Business profile for A2P
2

Navigate to the Trust Center

In the left sidebar, go to Settings > Phone Numbers > Trust Center (sometimes located under Compliance).
Trust Center navigation
3

Register your brand

Click Register Brand. Enter your business information:
  • Legal business name
  • Business EIN or tax ID
  • Business type and industry
  • Website URL
  • Business address
Submit the brand registration. Brand approval typically takes a few minutes to a few hours.
4

Create a campaign use case

Once your brand is approved, click Add Campaign. Describe how you will use SMS:
  • Select the appropriate use case (Marketing, Customer Care, Mixed, etc.)
  • Write a clear, detailed description of the messages you send
  • Add at least 2 sample messages that represent typical outgoing SMS content
Be specific and accurate in your description. Vague campaign descriptions are the most common cause of registration delays or rejections.
5

Wait for campaign approval

Campaign approval takes anywhere from a few hours to several business days depending on the use case. You will be notified when the campaign is approved.
Campaign registration form
6

Link your phone number to your brand

After approval, ensure your purchased phone number is associated with your registered brand and campaign. This links your number to your approved registration for compliant sending.
7

Enable Shaken/STIR for voice calls (optional)

For voice calls, enable Shaken/STIR Trusted Calling to validate your caller ID and reduce the chance of calls being labeled as spam. This is configured in the phone number settings.

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Key points

A2P 10DLC (Application-to-Person 10-Digit Long Code) is a US carrier framework that requires businesses to register their brand and campaign before sending text messages. It improves deliverability and reduces filtering of legitimate business messages.
You need your legal business name, EIN, business type (LLC, sole proprietor, etc.), website URL, authorized representative contact information, and sample SMS message content.
Brand registration is typically approved within minutes to a few hours. Campaign approval takes longer — usually 1 to 5 business days. Complete this process before launching any SMS campaigns.
Without A2P registration, SMS messages sent through 10-digit long codes may be filtered or blocked by carriers, resulting in failed deliveries and potential compliance violations.

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Key benefits

Registered campaigns experience significantly fewer carrier filters and blocks.
Establishes a legitimate, compliant communication channel with your contacts.
Ensures your business meets all US requirements for A2P messaging.
Compliant, registered messages build credibility with your contacts.
Shaken/STIR validation for voice calls prevents your number from appearing as spam to recipients.
Last modified on March 8, 2026