A2P 10DLC Registration for Contractors, in Plain English (2026)
In short
A2P 10DLC is the registration US carriers require before software can send business texts from a regular 10-digit number. You register your business as a brand, then describe your messages in a campaign. Most contractors with a tax ID fit Low-Volume Standard. Reviews can take days to weeks, and vague consent details are a common reason for delay.
A2P 10DLC stands for application-to-person, 10-digit long code. In plain English, it's the registration system US carriers use for business texts sent by software from a regular phone number. Twilio's documentation, checked in November 2026, says it exists "to ensure that SMS traffic to US end users through long code phone numbers is verified and consensual."
If you use software to send job reminders, follow-ups or missed call texts, this applies to you. Texting a customer by hand from your personal cell is different. This guide covers what you need to know before you start. This is general information, not legal advice.
Who needs A2P 10DLC registration?
Twilio's rule is broad: "Anyone sending SMS/MMS messages over a 10DLC number from an application to the US must register for A2P 10DLC." It adds, "This includes individuals and hobbyists using Twilio."
For a contractor, that usually covers:
- Appointment reminders and on-my-way texts
- Estimate follow-ups
- Missed call text back
- Review requests
- Texts sent from a CRM, field service app or marketing platform
Toll-free numbers and short codes aren't part of A2P 10DLC. They have their own processes. If your software vendor sends texts for you, ask whether it has registered your business, or whether that's your job.
What happens if you don't register?
Your texts are likely to cost more and arrive less reliably. Twilio says that registering "results in lower message filtering and higher messaging throughput," and that customers who don't register "will receive additional carrier fees for sending unregistered traffic."
In practice, that means a reminder that may never reach the customer, with no obvious sign that anything went wrong.
Which brand type fits a contractor?
Your brand is the business behind the messages. Twilio lists three types:
| Brand type | Who it's for | Daily limit (Twilio) | Campaigns |
|---|---|---|---|
| Sole Proprietor | No business tax ID | About 3,000 segments across US carriers | One per brand |
| Low-Volume Standard | Has a tax ID, sends modest volume | About 6,000 segments across US carriers | Up to five |
| Standard | Has a tax ID, sends higher volume | Depends on Trust Score | Up to five |
Most contractors with an EIN fit Low-Volume Standard. Twilio says it's "best suited for customers sending fewer than 6,000 message segments per day," which is far more than a typical shop sends. A one-truck owner with no tax ID may fit Sole Proprietor, but that type allows one phone number per campaign.
How does A2P 10DLC registration work?
There are usually three stages:
- Business profile. Your legal business name, address, contact details and tax ID, entered exactly as they appear on your tax records.
- Brand. Your business is registered with The Campaign Registry. Twilio says brands are typically approved "within a few minutes," though manual reviews can take "seven business days or more."
- Campaign. You describe what you send, who gets it and how they agreed. Twilio says reviews take "up to 5 business days for standard use cases."
Retell, a voice AI platform, tells its customers to expect around 2 to 3 weeks for the whole application, sometimes longer, because the review is manual. Build that into your plans.
What do you need before you apply?
Gather these first, because a messy application is what causes most delays:
- Legal business name and EIN, matching your IRS paperwork
- A live website on your own domain
- A privacy policy and terms, both reachable from the site
- A clear description of what you'll text
- Exactly how customers agree, such as a form or a verbal script
- Two or more sample messages that name your business and include opt-out wording
How much does A2P 10DLC cost?
It depends on your provider, your brand type and your campaign. Registration fees are usually one-time, and monthly campaign and per-message fees come on top.
As one published example, Retell's documentation listed the following as of September 2026: a $4 or $45 one-time brand fee, a $15 one-time campaign fee that's "non-refundable even if the campaign isn't approved," then $20 a month per number plus $0.01 per text once approved. Other providers charge differently, so get the full list from yours, including what happens if you're rejected.
Why do A2P campaigns get rejected?
The common problems come down to a mismatch between what you say and what reviewers can see:
- Vague consent. "Customers agree to texts" isn't enough. Describe the exact form or script.
- Business details that don't match. The legal name and tax ID must line up.
- Sample messages that don't fit. They should name your business, include opt-out wording and match your use case.
- Missing policy pages. Reviewers expect your privacy policy and terms to be easy to find.
- Mixed purposes. Reminders and promotions in a campaign marked as one narrow use case.
- Third-party sending. Retell lists "messaging on behalf of a third party" and "More than one brand in a campaign" among rejected uses, so one registration generally can't cover several businesses.
How should consent work on a phone call?
Carrier guidelines recognize verbal consent. CTIA's Messaging Principles say people may give permission "over text, on a form, on a website, or verbally" for informational messages. Marketing is held to a higher bar: express written permission.
Whatever method you use, keep a record. CTIA suggests retaining the timestamp, how consent was collected, the wording used, which campaign it applied to, and the phone number. Our missed call text back guide explains why a phone call alone may not count, and our AI receptionist liability guide covers related questions on what your systems say to customers.
Frequently asked questions
What does A2P 10DLC stand for?
A2P means application-to-person, or software texting a person. 10DLC means 10-digit long code, a regular local-style phone number. Together, they describe business texting from standard numbers in the US.
How long does A2P 10DLC registration take?
Twilio says brands are often approved in minutes and campaign reviews take up to five business days, but manual brand reviews can take seven business days or more. Retell tells customers to expect around 2 to 3 weeks in total. Plan for weeks, not days.
Do I need A2P 10DLC to text customers from my cell phone?
Generally no, if you're a person typing and sending individual messages from your own phone. The rule applies to texts sent through software or an application. If your app sends messages automatically, ask your vendor.
Do I need a website for A2P 10DLC?
In most cases, plan on having one. Retell's process requires privacy and terms URLs on your own domain. Twilio's Sole Proprietor path has different requirements, so check with your provider if you don't have a site.
Does A2P 10DLC apply to toll-free numbers?
No. Toll-free numbers go through a separate verification process, and short codes have their own too. Some platforms don't support texting from toll-free numbers at all, so ask before you choose.
Can my marketing agency register for me?
An agency or vendor can help with the paperwork, but the registration should describe your business and your messages. Make sure your legal details are correct and that you keep access to the account.