What is A2P 10DLC?

What does A2P 10DLC mean?

A2P 10DLC stands for application-to-person messaging over 10-digit long codes: texts that software sends on behalf of a business from an ordinary local phone number. Carriers treat all of it as business traffic that must be registered.

Twilio notes that US carriers consider all traffic sent through its platform to be A2P. If an app sends the text, including a missed-call text back, it counts.

Why do carriers require 10DLC registration?

Carriers require registration so they know who is texting their subscribers and why, which lets them cut spam without blocking legitimate businesses.

The industry rulebook is CTIA's Messaging Principles and Best Practices. Its 2023 update says every business sender should get consumer opt-in consent before texting and honor opt-out requests. Registration ties each number to a verified business and a declared use case, so carriers can hold senders to that standard.

In return, registered senders get better treatment. Twilio describes carriers' A2P 10DLC offerings as giving better delivery quality and lower filtering risk than unregistered long-code texting, plus higher throughput. Registration is separate from consent law, which is covered in is it legal to use AI to call and text customers.

How does 10DLC registration work?

You register in three layers: who you are, what you'll send, and which numbers send it. Brands can't register directly with The Campaign Registry; a campaign service provider files for you.

1. Business profile. Legal business name, address, business type and contact details, entered with your messaging provider.
2. Brand registration. Your provider submits the brand to TCR. Businesses with a Tax ID (EIN) register a Standard or Low-Volume Standard brand. Individuals and small businesses without an EIN in the US or Canada can use a Sole Proprietor brand.
3. Campaign registration. You describe the use case, write sample messages, explain exactly how customers opt in, and list opt-out and help keywords. For new campaigns submitted through Twilio's API after June 30, 2026, a privacy policy URL and a terms and conditions URL are required fields.
4. Vetting. Every campaign goes through manual review before approval.
5. Number assignment. Your 10-digit numbers are attached to the approved campaign, and carriers are notified to provision them.

Once all three layers are approved, texts from those numbers count as registered traffic.

What does 10DLC registration cost in 2026?

Registration costs a few dollars once plus a small monthly fee, and each text carries a carrier fee of a fraction of a cent. These are Twilio's listed pass-through fees as of October 2026; The Campaign Registry raised several of them on August 1, 2025.

Twilio's own base rate of $0.0083 per SMS segment comes on top of carrier fees. Other providers may bundle these into a plan price. For how texting fits into total cost, see AI receptionist cost.

How long does approval take?

Plan on one to two weeks, and occasionally longer. The brand is fast; the campaign review is the wait.

• Brand: Twilio says brand registration typically completes in a few minutes and can take up to 24 hours.
• Campaign: Twilio says vetting takes about 7 business days for standard use cases and has warned it can take up to 10 business days during heavy submission periods.
• Provider estimates vary: Quo (formerly OpenPhone) tells customers registration can take 5 to 7 business days and as long as 30 days.
• Numbers: After approval, carriers can take a few more days to provision your numbers.

A rejected campaign restarts the clock, and Twilio notes resubmission can bring additional charges, so getting it right the first time matters. This is why Arifwork tells clients that texting registration can add a week or two to the roughly one-week setup described on how it works.

Which brand type fits a small business?

Most small businesses with an EIN should register a Low-Volume Standard brand. Pick by tax status and daily volume.

A busy plumbing shop sending confirmations, reminders and replies rarely approaches these limits. A multi-location brand running texting for several teams may need Standard.

What happens if you don't register?

Your texts don't arrive. Twilio fully blocks US-bound texts from unregistered 10DLC numbers and has since September 1, 2023. Blocked messages return error 30034, and Twilio still charges its messaging rate for them.

Registration also isn't optional for small senders. Twilio states that all texts from its 10DLC numbers to US mobile numbers fall under A2P rules regardless of volume.

The alternatives have their own paperwork. Toll-free numbers require separate toll-free verification, and short codes are a different program altogether. For most local businesses, registering the 10-digit number customers already know is the simplest path.

How do you get approved the first time?

• Match your records exactly. Use the same legal name, EIN and address everywhere.
• Have a live website with a privacy policy and terms page.
• Describe opt-in precisely. Say where and how customers agree to texts: a web form checkbox, a booking page, or texting you first. CTIA expects a clear call to action.
• Write realistic sample messages that include your business name and "Reply STOP to opt out."
• Choose the right use case. Customer care and appointment messages are different from marketing. Twilio notes mixed campaigns can get lower throughput.
• Don't text before approval. Pending registrations are treated as unregistered.

Arifwork handles A2P 10DLC registration for every client as part of setup. If you're building it yourself, start with how to set up missed-call text back. If you'd rather hand it off, book a demo. And to see what slow replies cost you meanwhile, try the missed-call calculator.

Frequently asked questions