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What is 10DLC and do alert texts need it?

10DLC (10-digit long code) is a normal local phone number, with an area code, that a business registers before it sends texts in the US. Registration covers the business itself and each kind of texting it does. Unregistered 10DLC texts are now blocked by the major networks.

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Glossary

10DLC

In plain English, with what it means for alert texts.

Illustration of 10DLC.

How 10DLC registration works

There are two parts. The brand comes first: the company's legal name, tax ID and contact details.

Next comes the campaign. It says what the texts are about, who gets them and how those people agreed. Each campaign is reviewed before texts can flow.

What changed for 10DLC in 2025

Since February 1, 2025, unregistered 10DLC traffic has been fully blocked by major US networks, as reported by Bandwidth's 10DLC FAQ (read October 5, 2026). Before that, it was often slowed or filtered instead.

For a team that set up its own texting years ago, this can mean alarms stopped with no warning. The alert email still went out, but the text never reached a phone.

A 10DLC number next to a toll-free number

On the phone, a 10DLC sender looks like any local caller, not a name like an alphanumeric sender ID. A toll-free number starts with a prefix such as 888 instead.

Two kinds of business sender numbers
10DLC (local):   (614) 555-0187
Toll-free:       (888) 555-0163

10DLC vs toll-free vs short code

All three are US business sender numbers, each with its own review. 10DLC is a local number. Toll-free uses a code like 800 or 888 and goes through verification instead.

A short code is a 5 or 6 digit number used mostly for high-volume texting. None of them is the old free email-to-SMS gateway, which needed no registration.

What 10DLC means for your alert texts

If you text alarms from your own local number, you need both registrations before the first alert goes out. That means forms, reviews and a wait.

Welco sends from verified toll-free numbers, not 10DLC, so there is no brand or campaign for you to file. The 10DLC guide for alert texts goes deeper. Related terms are in the SMS alert glossary.

Frequently asked questions

What does 10DLC stand for?

It stands for 10-digit long code. That is an ordinary US phone number with an area code, as opposed to a 5 or 6 digit short code. The registration rules are what make it a 10DLC sender.

Which number type do Welco alert texts come from?

Verified toll-free numbers. Welco does not use 10DLC for alert texts. You verify your business once when you sign up, and the number side is handled from there.

Is there a fee to register for 10DLC?

Usually, yes. Texting providers tend to pass on one-time brand and campaign fees, and often a monthly campaign fee. The amounts vary by provider, so check yours before you plan a do-it-yourself setup.

How long does 10DLC campaign approval take?

It often takes days, and a rejected campaign can add weeks. Reviewers send back campaigns with vague samples or unclear consent. Plan for the wait before you rely on a new local number for alarms.

Text alarms without registering a local number

Sign up, verify your business and point your alert email at Welco.

Start free trialBook a demo

7-day free trial, 15 message creditsCard required for verificationNo charge for 7 daysEmail reminder before billing