A2P 10DLC, explained for small businesses
A2P 10DLC is the US carrier registration that lets a normal 10-digit business number send application-to-person texts. Without it carriers silently filter your messages — they do not bounce or error, they simply never arrive. Registration takes about a week and requires your legal business name, EIN and address.
Why your business texts silently vanish if the number isn't registered — and why registration takes a week rather than a click.
If you’ve tried to send business texts from a software tool and found that some never arrive — no error, no bounce, just silence — this is almost always why.
What it is
A2P 10DLC stands for Application-to-Person messaging over 10-Digit Long Codes: any text sent by software from a normal 10-digit US phone number. US carriers require these numbers to be registered before they’ll carry that traffic reliably.
Registration has two parts:
- A brand — your actual business. Legal name, address, EIN, website.
- A campaign — what you’ll send, how people opt in, and sample messages. The wording is reviewed and matters.
The failure mode nobody warns you about
An unregistered number does not error. Your sending platform accepts the
message and reports success. Carriers then filter it silently. Your logs say
sent, your dashboard looks healthy, and nothing arrives.
This is worse than a hard failure, because everything downstream looks fine. We ran into exactly this: a client’s number was outside the registered campaign, and the only way to know was to check the carrier registration directly rather than trust delivery logs.
If business texts are mysteriously not landing, check registration before you debug anything else.
Why it takes about a week
Carrier review is a human-scale process. Brand vetting is usually quick; campaign approval is where time goes, and where rejections happen — most often because the described opt-in doesn’t match what the business actually does.
There are one-time registration fees plus a small recurring campaign fee. Budget in the tens of dollars, not hundreds, but budget the time.
Registration is not consent
Two separate things, often confused:
- 10DLC registration is carrier permission to use the network.
- Consent is legal permission to text a specific person, governed by the TCPA — and its rules are strict, with real penalties.
Registration doesn’t grant consent. Cold texting a prospect who never opted in is a legal problem whether or not your number is registered.
This is why texting and calling aren’t interchangeable. Cold calling a business line is comparatively lightly regulated. Cold texting the same business is not. Any tool that offers “email, calls and texts” as three equivalent checkboxes is skipping past a real distinction.
What to take away
- Software-sent texts from a 10-digit number need brand + campaign registration
- Unregistered traffic is filtered silently — logs will lie to you
- Allow about a week, and expect the campaign wording to be scrutinised
- Registration ≠ consent. Cold texting has its own legal footing, and it’s narrower than cold calling