What Is 10DLC? A Plain-English Guide for Sales Teams That Text

If your team sends texts from a regular local phone number, you are sending over 10DLC — and in the US, that traffic now has to be registered before carriers will deliver it. This guide covers what 10DLC is, what registration involves, and the mistakes that get sales teams rejected or filtered.

What 10DLC means

10DLC stands for 10-digit long code: an ordinary ten-digit US phone number, like the one on your cell. When a business uses one of these numbers to send messages from software rather than from a person's phone, carriers call it A2P (application-to-person) messaging.

Local numbers are what most sales teams want. A text from a local area code looks and feels like a conversation, and prospects can reply naturally. The trade-off is that carriers treat A2P traffic on these numbers as business messaging, with rules to match.

Why registration exists

Before 10DLC rules, business texting on local numbers was largely unregulated, and spam filled the gap. The major US carriers responded by requiring every business sending A2P texts over 10DLC to register with a central industry registry: identify itself, and describe what it sends.

The practical effect: since February 2025, unregistered 10DLC traffic is blocked. Registration is no longer a way to get better delivery — it is the price of getting delivered at all.

The two registrations

1. Brand registration — who you are

Your brand is your business. Registration asks for details that can be verified:

• Legal business name, exactly as it appears on your tax records
• Business type, and for most businesses an EIN (US federal tax ID)
• Business address, website, and a contact
• Your industry vertical

These details are checked against public records. A mismatch — a DBA where the legal name should be, an address that doesn't match the EIN — is one of the most common reasons a brand fails verification.

2. Campaign registration — what you send

A campaign describes a type of messaging, not a single blast. You register the use case (for example, marketing, customer care, or account notifications) and show carriers how it works:

• A description of what you send and who receives it
• Sample messages that look like the real thing
• How recipients opt in — the exact place and wording where they give consent
• Your opt-out and help language (STOP and HELP keywords)

Campaigns are reviewed before they're approved, and approval can take anywhere from a few days to a few weeks.

Why campaigns get rejected

Most rejections come down to carriers not being able to confirm what you told them:

1. No clear opt-in. "Customers agree to receive texts" isn't enough. Show where consent happens — a web form with checkbox language, a keyword they text in, a signed form.
2. A website that doesn't back you up. Reviewers visit your site. It should be live, match your brand name, and have a privacy policy that says you don't share mobile numbers or consent with third parties for their marketing.
3. Sample messages that don't match the use case. Samples should name your business and look like what you actually send.
4. Missing opt-out language. Samples should show recipients how to stop messages, such as "Reply STOP to opt out."
5. Mixed use cases. Marketing traffic under a customer-care campaign is a fast way to get filtered later, even after approval.

Registration isn't the finish line

Approval gets you in the door; how you send decides whether you stay there. Carriers watch complaint rates, opt-out rates, and sudden volume spikes. Teams that keep deliverability healthy tend to:

• Message people who actually asked to hear from them
• Honor opt-outs immediately and permanently
• Ramp volume gradually on new numbers instead of blasting on day one
• Keep message content consistent with the registered campaign

What about toll-free numbers and short codes?

Toll-free numbers also support business texting, with their own verification process. They work, but an 8XX number doesn't feel local, which matters for reply rates in sales. Short codes (5–6 digit numbers) handle very high volume but cost more and take longer to provision. For most sales teams, registered 10DLC numbers are the balance of reach, cost, and a local feel.

The short version

• Texting from software over local numbers is 10DLC, and it must be registered.
• You register a brand (who you are) and a campaign (what you send).
• Most rejections trace back to unclear consent, a weak website, or samples that don't match.
• After approval, deliverability depends on sending behavior.

Signilio handles 10DLC brand and campaign registration as part of onboarding — we register your brand, configure your numbers, and get your first campaign out the door with you. Tell us about your team and we'll get you set up.

This article is general information, not legal advice. Carrier requirements change; confirm specifics for your business before you send.