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Documentation Index

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A2P 10DLC (“Application-to-Person on 10-digit long codes”) is the registration program every US business has to complete before sending text messages to customers. Clarky walks you through it on the Texting settings page and previews exactly what to copy into Twilio.

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Why It’s Required

US mobile carriers require every business that texts consumers to register their brand and the kinds of messages they plan to send. The goal is to cut down on spam and to give customers a reliable way to opt out.
If you send messages without registering, carriers will filter or block your texts and Twilio may suspend your number. Complete A2P registration before launching any SMS use case.

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What You’ll Need

Before you start, gather:

Business identity

Legal business name as it appears on your IRS EIN documents, plus a DBA / brand name if you use one.

EIN entity type

Whether your business is a private company, public company, non-profit, sole proprietor, or government entity.

Website

A live website with a Privacy Policy and Terms of Service page. Required.

Support contacts

A support email and phone number customers can reach you at.

Industry

The vertical that best describes your business (healthcare, retail, real estate, etc.).

Use case details

What kind of messages you’ll send (marketing, customer care, or both), how often, and how customers opt in.

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Filling Out the Form

1

Pick your business entity type

This must match the entity type on your IRS EIN documentation exactly.
2

Enter your business name and DBA

If your customers know you by a different name than your legal name, mark “Yes, I use a DBA” and provide the public brand name.
3

Describe your business

A few sentences about what you do. Click Generate from Knowledge to have Clarky draft a description from your agent’s knowledge base — you can edit it from there.
4

Pick an industry

Search the list and choose the industry that best fits. Healthcare verticals trigger an extra HIPAA reminder.
5

Add website and support details

Make sure your site has reachable Privacy Policy and Terms of Service pages before submitting.
6

Choose how customers opt in

Website form, paper form, Facebook lead form, QR code, kiosk, or verbal. Pick whichever matches reality.
7

Pick message types

Most businesses send both marketing and customer care messages. Selecting both keeps you flexible.
8

Pick a campaign use case

“Low Volume Mixed” is the recommended option for most small businesses.
9

Pick a message frequency

Pick a slightly higher tier than you think you need to stay compliant if volume grows.
10

Save

Clarky stores your registration, generates a compliant opt-in form for you, and shows the exact Twilio fields to copy in the live preview panel.

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Live Twilio Preview

As you fill out the form, Clarky shows the exact text to paste into each Twilio field on the right side of the page:
  • A2P Campaign Use Case
  • Campaign Description
  • Two sample messages
  • Consent description (“How do end-users consent?”)
  • Privacy Policy and Terms of Service URLs
  • Opt-in keywords, opt-in message, STOP response, HELP response
Click any field to copy it, then paste it into the matching field in the Twilio A2P onboarding console.

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Approval Timing

Once submitted to Twilio, brand verification typically takes a few business days, and campaign approval typically takes another few days on top of that. Carriers occasionally take longer during high-volume periods.
Start the registration process before you actually need to send messages. Approval can take a week or more end-to-end.

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Healthcare and HIPAA

If you select a healthcare-related industry, Clarky shows a HIPAA reminder. Never include Protected Health Information (PHI) in SMS — appointment reminders and replies should stay generic (“You have an appointment tomorrow at 2 PM” rather than anything diagnostic).

Back to Texting Settings

Return to Texting Settings