If your business texts customers — appointment confirmations, on-my-way messages, quotes — there is a set of carrier rules you have probably never heard of that quietly decides whether those texts arrive at all. It is called A2P 10DLC, and over the last few years the big US mobile carriers have made it mandatory for business texting from regular phone numbers. Trades businesses keep discovering it the hard way: texts that used to deliver start silently vanishing, with no error and no bounce, and customers stop replying because they stopped receiving. Here is what the system actually is, in plain language, and what a home-services business needs to do about it.
What A2P 10DLC actually means
Unpack the jargon and it is simple. “A2P” means application-to-person — any text sent by software on behalf of a business, as opposed to one person thumbing a message to another. “10DLC” means ten-digit long code: a normal, local-looking phone number, as opposed to a short code or a toll-free number. So A2P 10DLC is business texting from regular phone numbers — exactly what a scheduling tool, a review-request tool, or an answering service sends. The carriers now require that this kind of traffic be registered: they want to know which business is sending, what kind of messages, and that recipients agreed to get them.
Why the carriers built this
Spam. Text messages get opened and read at rates email marketers can only dream about, which made texting irresistible to scammers, and the flood of fraud texts was burning the channel down for everyone. The carriers’ answer was to require every business sender to register — who you are, what you send, how people opted in — and to filter unregistered traffic. It is fair to grumble about the paperwork, but the goal is one a legitimate business shares: when texting stays trusted, your appointment confirmation gets read. The registration system is called the Campaign Registry, and it sits between your texting provider and the carriers.
The carriers no longer assume a business text is legitimate. Registered traffic gets through; unregistered traffic gets filtered — often silently.
What registration involves
You almost never deal with the Campaign Registry yourself — your texting or phone provider files on your behalf. But you will supply the ingredients, and it helps to know the two layers. First, the brand: your legal business identity — legal name, address, and tax ID (your EIN). Second, the campaign: a description of what you send, such as appointment reminders and customer-service messages, and how customers consent to receive them. There are small one-time and monthly registration fees that providers typically pass through, and approval can take from days to a few weeks depending on how clean your paperwork is. This is one of several places where having a proper legal entity with an EIN, and using identical business details everywhere, saves real friction.
What happens if you skip it
Unregistered A2P traffic gets filtered, throttled, or blocked outright — and the cruel part is the silence. Your software shows the message as sent; the customer simply never sees it. Signs it is happening to you:
- Customers say “I never got your text” more than occasionally, especially customers on certain carriers.
- Reply rates to confirmations and reminders drop off a cliff without any change on your end.
- Messages with links are affected worst — link-heavy texts from unregistered numbers are prime filtering targets.
- Group messages or bursts (like a morning’s worth of reminders) deliver spottily while one-off texts from your cell work fine.
Toll-free numbers and short codes: the other lanes
10DLC is not the only way businesses text, so for completeness: toll-free numbers (the 800-style prefixes) have their own separate verification process — not the Campaign Registry, but the same idea of vouching for the sender — and unverified toll-free traffic gets filtered just as aggressively. Short codes, the five- and six-digit numbers big brands use, deliver at high volume but cost far more than a small business can justify. For a trades company the practical answer is almost always the local ten-digit number, properly registered: customers recognize the local area code, you can call and text from the same identity, and registration is a one-time chore rather than an ongoing expense at short-code scale.
Myths worth clearing up
- “This is only for mass marketing.” No — appointment reminders, on-my-way texts, and review requests sent by software are all A2P traffic, even at small volume.
- “Texting from my personal cell is illegal now.” No — one person texting another from a phone is person-to-person traffic, and none of this applies. The rules cover software sending on your behalf.
- “My provider handles all of it.” Partly. Good providers file the registrations, but they file with your business details and your consent story — you cannot outsource being registrable.
- “Once registered, anything goes.” No — filtering still applies to registered senders who draw complaints. Consent and STOP-handling stay on you.
Consent, in plain terms
Registration is half the system; consent is the other half. The working rules are simple enough to run a business by. Text people who asked to be texted — a customer who gave you their number for scheduling has consented to scheduling texts, not to a marketing drip. Honor STOP immediately and without argument. Identify your business in the message. Keep marketing separate from transactional messages, because the consent bar for promotions is higher. None of this is exotic: it is the texting equivalent of not cold-calling at dinner, and it is also what keeps your number’s reputation clean with the carriers’ filters.
What this means for a trades business
Three practical takeaways. First, if any software texts your customers from a regular number, ask that provider point-blank whether the traffic is registered under A2P 10DLC and under whose brand — a good provider answers immediately. Second, get your paperwork consistent: legal name, address, and EIN matching across your registrations, because mismatches are the most common approval snag. Third, do not build a critical workflow on unregistered texting; it will degrade silently, and you will blame your customers’ phones instead of the real cause.
On timing: if you are forming an LLC or getting an EIN anyway, do that first — the registration rides on your legal identity, and re-filing after an entity change is avoidable paperwork. And if you are about to switch phone or texting providers, ask how your existing registration transfers before you move. Campaigns are tied to providers in ways that can mean re-registering from scratch, and the approval wait is the same the second time.
It is also why, at ClearLine, the lead alert that matters is never only a text. When Cara answers a call, the lead lands in your app and your email with a push notification a minute or two after the call ends — and SMS alerts are added after you explicitly opt in, not as the single fragile thread your business hangs on. Texting is a great channel; carrier-filtered texting is a silent leak. Know which one you have, register what you send, and your messages — like your phone — will actually get answered. The rules are not going away; the businesses that treat them as table stakes are the ones whose confirmations keep landing.