10DLC and SMS Compliance, Explained Simply for Small Businesses

If you've tried to set up business texting, you've hit a wall of jargon: 10DLC, A2P, TCR, brand registration, campaign approval. It sounds intimidating, but the core idea is simple: carriers want to know who's sending texts and that recipients agreed to receive them.Here's the plain version.

What is 10DLC?

10DLC stands for “10-digit long code” — a normal local phone number approved to send business (A2P, or application-to-person) texts. To use one, you register your business and your messaging program with The Campaign Registry (TCR), which the carriers use to vet senders. Once approved, your texts are trusted and delivered reliably.

The two things you register

• Your brand — basic business details: legal name, address, contact, and (for companies) an EIN. Sole proprietors can register without an EIN.
• Your campaign— a description of what you'll text, sample messages, and how people opt in. This is what carriers actually approve.

Opt-in: the part that matters most

You can only text people who gave express consent. That means a clear opt-in — a checkbox on a form, a keyword they text, a verbal or written agreement — where it's obvious they're signing up for texts. Your opt-in should mention message frequency, that “message and data rates may apply,” and how to get help or stop. Buying lists or texting people who didn't agree is both illegal (TCPA) and the fastest way to get blocked.

STOP and HELP

Two keywords are mandatory. STOP unsubscribes someone instantly — carriers enforce this automatically, and you must never message them again unless they opt back in. HELPreturns your business name and a way to get support. Honoring these isn't just compliance; it keeps your number healthy and your messages out of spam filters.

What it costs

Registration carries a small carrier/TCR fee — a one-time charge to register your campaign plus a few dollars a month. It's a pass-through cost set by the carriers, not the platform, and it's what buys you reliable delivery.

The good news: you don't do this alone

Done by hand, 10DLC is a headache. A good platform walks you through it. Sendline guides brand and campaign registration step by step, fills in compliant sample wording and opt-in language, and handles STOP/HELP automatically — so you can focus on the message, not the paperwork. Create a free account or see pricing to get started.