How to Register for A2P 10DLC (Step-by-Step)

What is A2P 10DLC registration and why does it matter?

A2P 10DLC registration is the process of telling US carriers who you are and why you’re texting before your business messages will deliver reliably.

If you’re not sure what A2P 10DLC is yet, start with our plain-English explanation of what A2P 10DLC means and why carriers require it — then come back here for the registration procedure.

For everyone already familiar: registration runs through The Campaign Registry (TCR), a neutral hub that major US carriers (AT&T, Verizon, T-Mobile) use to verify business identities. There are two distinct steps — brand registration and campaign registration — and each has its own timeline and requirements.

What do you need before you start?

Gather these before opening The Campaign Registry — missing information is the most common reason registration stalls.

For brand registration:

• Legal business name (must match IRS records)
• EIN (Employer Identification Number) — SSN is not accepted
• Business address
• Business website URL
• Business email and phone number

For campaign registration:

• A description of your messaging use case (appointment reminders, customer care, marketing, etc.)
• How you collect opt-in from your contacts — the specific method, not a vague statement
• Sample messages — typically two or three, showing the actual text recipients would receive
• Opt-out language in every sample (“Reply STOP to unsubscribe” or equivalent)
• Opt-in language if your messages include marketing content

Your website must be live, accurate, and match your registered business. A website that doesn’t mention your texting program or that looks incomplete is a common rejection trigger.

Step 1: Register your brand

Brand registration establishes your business identity with The Campaign Registry.

Submit your legal business name, EIN, address, and website through your messaging platform’s TCR integration — most platforms (Twilio, SignalWire, GoHighLevel, and others) have a registration flow built into their settings. You don’t typically access TCR directly as a small business; you go through your platform.

Brand registration is reviewed quickly — often within a few minutes to a day or two. Once approved, you get a brand ID you’ll use for the next step. This is a one-time registration per business, not per phone number.

Common brand registration rejections:

• EIN doesn’t match the business name on record
• Website is under construction, password-protected, or missing
• Business type doesn’t match what the EIN is registered as (e.g., LLC vs. sole proprietor)

Step 2: Register your campaign

Campaign registration is where you describe how and why you’re texting — and it’s where most delays happen.

A “campaign” in A2P terms is a messaging use case, not a marketing campaign. You’ll register one campaign per distinct use case. Common use case types:

• Customer care — support, follow-up, operational messages
• Marketing — promotional content, offers
• 2FA / OTP — one-time verification codes
• Appointment reminders — scheduling confirmations and reminders
• Mixed — multiple use cases combined (often requires more documentation)

For each campaign, you’ll provide:

1. A use case description — plain, specific, and matching your sample messages
2. Two to three sample messages — real examples of what you’d send
3. Opt-in method — how subscribers consented (web form, in-person, existing customer, etc.)
4. Opt-out confirmation — what you send when someone replies STOP
5. Whether your messages contain embedded links, phone numbers, or age-gated content

Carriers review campaigns individually. Timelines vary by use case and carrier review queue — some campaigns clear in a few days; others with more sensitive content or complex use cases can take longer. Marketing and mixed-use campaigns generally take more time than straightforward customer-care or reminder use cases.

What happens during carrier review?

Carriers check that your campaign description matches your sample messages, that your opt-in process is credible, and that your content doesn’t fall into restricted categories.

Restricted and high-scrutiny categories include: payday loans and high-interest lending, cannabis, firearms and ammunition, gambling, and adult content. If your business touches any of these, expect additional vetting or outright restrictions depending on the carrier.

Once a campaign clears carrier review, your registered 10-digit number is whitelisted for that use case. You’ll typically see approval reflected in your platform’s messaging dashboard.

Common registration rejections (and how to avoid them)

Most rejections come down to a mismatch between what you claim and what carriers can verify.

Rejection: website doesn’t support the use case. Fix: make sure your website mentions the service you’re texting about and includes a privacy policy that references your texting program.

Rejection: opt-in method is too vague. Fix: be specific — “customers submit a web form at example.com/booking and check a checkbox to receive appointment reminders” is reviewable. “Customers opted in” is not.

Rejection: sample messages don’t match the use case. Fix: write sample messages that actually represent what you’ll send. If you registered for “appointment reminders” but your samples read like promotional copy, that’s a mismatch.

Rejection: missing opt-out language in samples. Fix: every sample message must include opt-out language. “Reply STOP to unsubscribe” in at least one sample is typically required; including it in all samples is safer.

Rejection: restricted content. Fix: some content categories cannot be registered on standard 10DLC. If your use case touches a restricted category, talk to your messaging platform about alternative number types (short codes, toll-free) that have different registration paths.

How does A2P 10DLC registration connect to TCPA compliance?

Registration and compliance are related but separate obligations.

A2P 10DLC registration is the carrier requirement — it’s about message deliverability. TCPA (Telephone Consumer Protection Act) is the federal law — it governs consent, opt-out, and how businesses can legally contact consumers. Registration doesn’t exempt you from TCPA, and TCPA compliance doesn’t substitute for registration.

Both are required. The short version of TCPA for texting:

• Only message contacts who have given appropriate consent
• Include opt-out language in every message
• Honor opt-out requests immediately and permanently
• Never text numbers on the Do Not Call Registry without prior express written consent for marketing

For the complete compliance picture — what TCPA requires, what A2P covers, and where the two overlap — the AI texting legal guide covers it in detail.

How does this work with AI text automation?

Every AI automation that sends SMS must be registered — the source of the message (human or AI) doesn’t change the carrier requirement.

A missed-call text-back, a reactivation campaign, an appointment reminder sequence — all of these are programmatic messages under the A2P definition, and all require a registered campaign that matches the use case. If your AI is sending texts and those texts come from an unregistered number, they’ll be filtered before they reach anyone. The automation runs; the messages don’t arrive. See missed-call text-back setup and ROI for a concrete example of how this works in practice.

At Digital Monestary, A2P 10DLC registration is part of every SMS-enabled AI agent we build. Brand registration, campaign registration, opt-out plumbing — all handled in the $1,500 setup so your messages go out compliant and deliverable from day one.

What does it cost to get started?

The lowest-risk way in is The Revival — free to start, and you pay only on booked revenue.

If you want a standing AI agent handling your texts every month — missed calls, reactivation, reminders — that’s a single Agent at $497/mo plus a $1,500 setup. One agent, one job, A2P registration included. Prices don’t stack; you sit on one rung at a time.

Book a free demo and we’ll walk through your specific use case, what registration looks like for your business, and what the first campaign would send.