Definition: 10DLC (10-digit long code) is a standard 10-digit US business phone number approved by carriers for application-to-person (A2P) text messaging.

A 10DLC number looks just like a local phone number. The difference is what sits behind it. Before a business can send texts from software (like reminders, alerts, or marketing), the number must be tied to a registered brand and campaign.

How does 10DLC registration work?

Sinch lays out the basic steps, and most providers follow a similar path:

1. Register your brand. Your provider sends your company name, tax ID, and contact details to The Campaign Registry (TCR). Sinch says these details must be 100% accurate.
2. Register a campaign. You describe what you will send, how people opt in, and add your website, privacy policy link, terms link, and sample messages.
3. Link your numbers. You buy or port numbers and attach them to the approved campaign.

How much can a 10DLC number send?

Limits depend on your brand type. Twilio lists these examples:

Why it matters for your website

Reviewers check the website on your registration. It must be live, public, and clearly show the same business as your brand. Parked domains, pages under construction, and form-only pages are rejection reasons on Twilio. See the full 10DLC website requirements.

Related terms: A2P, TCR, Campaign use case, Short code, Toll-free verification

Sources

• Sinch: What is 10DLC?
• Twilio: A2P 10DLC overview
• Twilio: A2P 10DLC quickstart
• The Campaign Registry: CSP User Guide (October 2025)
• Vonage: 10DLC Campaign requirements

Not sure your website is ready for review? Run it through our compare your site with the checklist, or see what a carrier-ready site includes.