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9 Oct 2026 · 3 min read

Explainer

Unregistered numbers send texts nobody receives

In the US, a business text from an unregistered number is blocked before it reaches the phone. Registration fixes it. It asks who you are and what you send.

Unregistered numbers send texts nobody receives

Sent. Never arrived.

A customer books a job for Thursday. On Wednesday, your system sends the reminder. Thursday comes, and nobody is home. They never got the text. It didn’t reach their phone.

In the US, this happens when the business number was never registered with the carriers. The carrier blocks the text on the way. You get no warning. The empty slot is the first sign. The fix is called A2P 10DLC registration. It applies to US numbers only.

What is A2P 10DLC registration?

It’s how a US business tells the phone carriers who it is and what its texts are for. A2P means a business system texting a person. 10DLC means a normal 10-digit phone number. Register, and the carriers let your texts through. Skip it, and they block them.

The rule started on September 1, 2023. Since then, a text to a US phone from one of these numbers has to go out under a registered campaign. Texts from numbers that aren’t get blocked, Twilio’s notice says. That covers reminders, quotes, replies and every other text a system sends for you.

The carriers want to know two things. Is the business real? And did the person agree to get the texts? Twilio’s guide to the rule says it exists so that texts are checked and wanted.

What does registration ask for?

Two parts. The first is the brand, which is your business. The second is the campaign, which is what your texts are for. Twilio lists what each part needs:

  • Your legal name. It must match the name on file for your EIN, the federal tax ID.
  • Your EIN. The Campaign Registry asks for it to check the business. Sole owners without one go a different way.
  • A working website. It has to belong to the business doing the texting.
  • What the texts are for. Who sends them, who gets them, and why. Reminders and quotes are typical.
  • Two to five sample texts. Real examples of what you’ll send.
  • How people say yes. The form or booking page where they agree to texts. A public privacy policy goes with it.

Be plain and exact. If the answers are vague, carriers can send the campaign back for changes. While it waits, the texts still don’t land.

It matters more than it looks. A reminder that never arrives is a missed job. A reply to a new inquiry that never arrives is a lead that thinks you didn’t answer. That’s how leads go cold without anyone doing anything wrong.

In Income Mavericks, registration is done inside the account as part of setting up texting. If you text from some other tool, ask whoever set it up one question. Is this number registered? It’s a yes or no answer.

A text the carrier blocks looks just like a text the customer ignored.

Before the first reminder goes out, the number, the brand and the campaign all have to line up. That’s true whether you set texting up yourself or as part of an automation build.

It’s paperwork, not tech. A form about who you are and what you send. Once the carriers have it, Wednesday’s reminder reaches the customer.

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