What Is 10DLC Registration and Why You Need It

What 10DLC Stands For

10DLC stands for 10-Digit Long Code. A long code is a standard 10-digit phone number (like 555-123-4567), as opposed to a short code (a 5 or 6 digit number like 12345). Before 10DLC, businesses could send texts from any local phone number without registration. Carriers had no way to distinguish legitimate business messages from spam, so they imposed blanket restrictions that hurt everyone.

The 10DLC program, launched by The Campaign Registry (TCR) and adopted by AT&T, T-Mobile, and Verizon, created a formal registration process. Businesses register their identity (brand registration) and describe their messaging campaigns (campaign registration). In return, carriers grant higher throughput limits and better delivery rates to registered senders.

Why Carriers Require It

Carriers implemented 10DLC to solve a massive spam problem. Before registration requirements, anyone could buy a phone number and start blasting texts. This led to billions of spam messages, consumer complaints, and carriers blocking legitimate business messages alongside the spam.

10DLC gives carriers visibility into who is sending messages and why. Registered businesses get better treatment because carriers can verify they are legitimate senders with real business identities. Unregistered senders get assumed to be spam and get blocked or severely rate-limited.

Brand Registration vs Campaign Registration

10DLC registration happens in two steps, and both are required before you can send.

Brand Registration

Brand registration verifies your business identity. You provide your legal business name, EIN (Employer Identification Number), business address, website, and contact information. The registry checks this against public business databases to confirm you are a real company. Sole proprietors can register with their personal information, though they receive lower throughput limits than verified businesses.

Campaign Registration

Campaign registration describes what you plan to send. You specify the type of messages (marketing, informational, customer care), include sample messages, describe your opt-in process, and confirm your compliance with messaging laws. Each campaign gets a use case classification that carriers use to set your throughput limits and filtering rules.

You can register multiple campaigns under one brand if you send different types of messages. For example, you might have one campaign for marketing promotions and another for appointment reminders, each with different sample messages and use cases.

Throughput Limits

Registered 10DLC numbers receive throughput allocations based on your brand trust score and campaign type. A typical registered business can send 75-300 messages per minute per number, compared to 1-5 messages per minute for unregistered numbers. Higher trust scores (based on brand verification quality) unlock higher limits.

If your sending volume requires more throughput than a single number provides, you can distribute campaigns across multiple numbers. The platform's volume management handles this distribution automatically when you configure multiple sending numbers.

What Happens Without Registration

Sending business text messages without 10DLC registration in 2026 results in one of these outcomes:

• Complete blocking. T-Mobile blocks unregistered A2P traffic outright. Messages simply never arrive.
• Severe throttling. AT&T throttles unregistered senders to approximately 1 message per minute, making bulk campaigns effectively impossible.
• Carrier surcharges. Some carriers impose higher per-message surcharges on unregistered traffic, making it more expensive even if messages do get through.
• Unpredictable filtering. Without registration, carriers treat your messages as untrusted and may filter them based on content patterns that would not trigger filtering for registered senders.

How to Get Started

Your SMS provider handles the 10DLC registration process on your behalf. You provide your business information and campaign details, and the provider submits the registration to The Campaign Registry. Once approved, your sending numbers are associated with your registered brand and campaign, and carriers grant the appropriate throughput limits.

For a complete walkthrough of setting up your first SMS campaign including 10DLC registration, see How to Start an SMS Marketing Campaign. For details on the related A2P messaging classification, see What Is A2P Messaging.