What Is 10DLC? Business Text Messaging Registration Explained

What Is 10DLC?

10DLC (10-digit long code) is a standard for business text messaging in the US that requires companies to register their brand and messaging campaigns with The Campaign Registry (TCR) before sending SMS or MMS at scale via standard 10-digit phone numbers. The programme was introduced by major US carriers — AT&T, T-Mobile, and Verizon — to verify who is sending messages and for what purpose. Legitimate business messages get higher throughput and better deliverability; unregistered bulk sending is filtered or throttled.

Why 10DLC Registration Exists

Before 10DLC, businesses could send bulk SMS from any unregistered long code. Carriers had no way to distinguish a legitimate appointment reminder from a spam campaign, so they applied blanket filtering policies that often caught both.

AT&T, T-Mobile, and Verizon introduced 10DLC as a solution: businesses declare who they are and what they will send, carriers review the registration, and approved senders are allowed to operate at reasonable throughput. The result is a more stable environment for transactional and marketing SMS, while making large-scale spam harder to run cost-effectively.

Unregistered 10-digit numbers that attempt to send bulk messages face throughput limits and may have their messages filtered entirely before they reach the recipient's device. If your transactional messages are not arriving reliably, lack of 10DLC registration is a common cause — alongside STIR/SHAKEN issues that affect voice calls on the same numbers.

How 10DLC Registration Works

Registration is a two-step process. Both steps are submitted through your messaging service provider, who interacts with TCR on your behalf.

1. Brand registration. You register your business entity with TCR — providing your legal company name, Employer Identification Number (EIN) for US businesses, business address, and website. This is a one-time step that ties your identity to your sending numbers. TCR performs a vetting check against business identity data.
2. Campaign registration. Each distinct messaging use case — customer notifications, marketing messages, two-factor authentication codes, appointment reminders, and so on — is registered as a separate campaign. You describe what messages you will send, to whom, and how recipients opted in. The campaign is linked to your registered brand and to the specific phone numbers that will send it.

Your brand is registered once. If you run multiple distinct message types, each requires its own campaign registration. Carriers use the campaign metadata to apply appropriate throughput levels and to verify that message content matches the declared use case.

Fees apply for both brand and campaign registration. Amounts change over time, so check current pricing directly with your messaging provider or at campaignregistry.com.

Who Needs to Register

Any US business sending SMS or MMS at meaningful volume from a 10-digit number needs 10DLC registration. This covers a wide range of common messaging types:

• Appointment reminders and scheduling confirmations
• Order confirmations and shipping notifications
• Marketing and promotional messages
• Customer service follow-ups
• Two-factor authentication and one-time passcode delivery
• Staff notifications and internal alerts sent via business numbers

Single personal-use messages sent from an individual's own phone do not require registration. The threshold is commercial or organisational bulk sending — if you are using a platform or API to send messages to customer lists, you need to be registered.

Businesses using a cloud communications platform that includes SMS capability should confirm with their provider whether 10DLC registration is handled on their behalf or requires separate action.

10DLC vs Toll-Free vs Short Code

Businesses choosing a messaging channel for scale should understand the differences between the three main options:

• 10DLC. Standard 10-digit numbers with moderate throughput once registered. Familiar to recipients as a regular phone number. Lower cost than short codes. The right choice for most small and mid-sized businesses sending transactional or marketing messages.
• Toll-free numbers (8XX). Have their own separate registration and verification process with carriers. Generally higher throughput than unregistered 10DLC, and usable for both voice and SMS. Some use cases suit toll-free better — particularly businesses that want a single national number for voice and text.
• Short codes (5–6 digits). Highest SMS throughput available, designed for high-volume campaigns. Expensive to lease, and provisioning can take several weeks. Typically used by large enterprises or services with very high message volumes. Short codes require carrier approval and dedicated content review.

For most SMBs, 10DLC is the practical middle ground: standard numbers, manageable registration requirements, and costs that are proportional to typical business messaging volumes.

What Happens Without Registration

Sending bulk SMS from an unregistered 10-digit number has increasingly predictable consequences:

• Carrier filtering. Messages may be silently blocked or discarded before reaching the recipient's device — with no delivery error returned to the sender.
• Throughput throttling. Unregistered numbers are assigned very low message-per-second limits. High-volume campaigns will queue indefinitely or fail.
• Number blocking. Persistent unregistered bulk sending can result in the sending number being blocked across carrier networks, affecting any future messaging or voice calls from that number. If your outbound calls already show as spam likely, unregistered SMS activity on the same number can compound the problem.

If your business is experiencing unexplained message delivery failures, 10DLC registration status should be the first thing to verify with your provider.

Frequently Asked Questions