Resource · A2P 10DLC · Plain English
If you send texts through a CRM, a marketing platform, or GoHighLevel without A2P registration, US carriers are silently filtering you out. No error, no warning—your follow-ups just never land. Here's what A2P 10DLC is, the mistakes that get you rejected, and the exact process to fix it.
No fluff. The mechanism, the mistakes, the fix.
A2P stands for Application-to-Person. It just means a business is sending a text to a customer using software—not thumbing it out from a personal phone.
10DLC stands for 10-Digit Long Code—the format of a standard US phone number, like the one your GoHighLevel account sends from.
Starting in 2021, every major US carrier—AT&T, T-Mobile, Verizon—made it mandatory for any business sending texts through software to register with The Campaign Registry (TCR). It applies to every business using a CRM, an SMS tool, or a platform like GoHighLevel. Size doesn't matter. There's no exemption for "small."
Bottom line: if you're sending business texts through any platform and you haven't registered, your messages are being filtered—or blocked outright—and you have no idea who isn't getting them.
Registration is cheap and takes less than a week. What it does is tell carriers three things: who you are, what kind of messages you send, and that your contacts actually asked to hear from you. Once approved, your messages go through.
Text has one of the highest open rates of any channel—over 90% within three minutes in most studies. But that number is only real when the message is actually delivered.
For a local service business where every lead counts, unregistered messaging is a real leak—especially when your whole follow-up sequence rides on SMS getting through.
Most rejections come from the same handful of preventable errors. Here's what businesses get wrong—and the quick fix for each.
The name you enter must match your IRS EIN letter exactly—capitalization included. "Paris Capers" is not the same as "Capers Ventures."
Generic privacy policies get rejected. Reviewers look specifically for text mentioning SMS or text-message consent. If it isn't there, you're out.
Every sample message you submit must include your business name. Reviewers won't guess who's sending the text.
TCPA compliance requires every marketing text to include opt-out instructions. Missing "Reply STOP" in your samples triggers rejection.
Reviewers physically visit your site. If it's offline, under construction, or behind a login—automatic rejection.
Selecting "2FA" or "Marketing" while describing general business messaging creates a mismatch that flags your registration.
One-sentence descriptions get rejected. Reviewers want to understand exactly who gets your messages and how they opted in.
Once your materials are ready, the process itself is straightforward. Here's what happens.
Submit your legal name, EIN, address, website, and industry to The Campaign Registry through your platform (like GoHighLevel). Approval is usually 24–48 hours.
Once your brand is approved, register your use case, sample messages, opt-in flow, and keyword responses (STOP, HELP). Approval typically takes 3–5 business days.
In platform settings, link the approved campaign to the number you send from. This activates full carrier trust for that line.
Send a test, confirm STOP and HELP keywords work, review your opt-in flow. Once confirmed, you're cleared to send—reliably and compliantly.
Plan for 7–10 days total from submit to send. Brand and campaign approvals don't happen the same day—budget for it before a launch depends on SMS.
Application-to-Person messaging over a 10-Digit Long Code (a standard US phone number). It means a business texts customers through software, not by hand. Since 2021, US carriers require any business texting through a CRM or platform to register with The Campaign Registry.
Carriers silently filter or block your messages. There's no error, so leads never get your follow-up, reminders vanish, and deliverability degrades over time—with risk of full number suspension.
Plan for 7–10 days total. Brand approval is usually 24–48 hours; campaign approval is typically 3–5 business days. They don't happen the same day.
For most small service businesses, choose "Mixed." It covers marketing, reminders, follow-up, and customer care in one campaign and avoids a mismatch between your stated use case and your real messages.
Usually: a name that doesn't match the EIN letter, a privacy policy missing SMS consent language, samples without the business name or a STOP opt-out, a website that's down at review, the wrong use case, or a vague campaign description. All seven are in the section above.
Yes. A2P registration is part of building a system whose follow-up actually reaches people. We set up the brand, campaign, opt-in language, and keyword responses inside the 30-Day Pipeline Sprint build—then hand it over to you, working. Start with the $27 audit and we'll tell you exactly where you stand.
Get it delivered
The audit tells you where your follow-up is breaking—SMS deliverability included. We build the fix into a system you own, and hand it over working.