10DLC Explained: Why Your Business Texts Need Carrier Registration

If your business sends text messages from a regular phone number in the US, carriers expect that number to be registered. The system is called 10DLC — "10-digit long code" — and it's the reason some businesses' texts deliver instantly while others silently vanish.

What 10DLC actually is

US carriers (AT&T, T-Mobile, Verizon) built the A2P 10DLC framework to separate legitimate business texting from spam. Businesses register who they are and what kind of messages they send. Registered traffic gets reliable delivery and higher throughput; unregistered business texting gets filtered, throttled, or blocked — increasingly without warning.

What registration involves

• Brand registration: your legal business name, EIN, address, and website. This proves you're a real business.
• Campaign registration: what you send — appointment reminders, customer-service replies, follow-ups — with sample messages and how customers opt in.
• Vetting: carriers score the registration. Sole proprietors without an EIN can register through a special low-volume class.

Approval typically takes a few days to a couple of weeks. Small one-time and monthly carrier fees apply (a few dollars to low tens of dollars depending on volume class) — a good platform passes these through transparently or absorbs them.

The compliance rules that actually matter

• Consent: text people who asked to hear from you — they called you, texted first, or opted in. Keep a record of it.
• Opt-out: honor STOP instantly and automatically, and keep an audit trail.
• Identification: say who you are in the message.
• Content: no prohibited categories (the carriers' list includes things like cannabis and high-risk financial offers — most local services have nothing to worry about).

What this means when choosing a phone system

Ask three questions: Does the platform walk you through 10DLC registration (or do you fend for yourself)? Does it handle STOP/START automatically with a consent log? Can you receive texts while outbound approval is pending? PhoneMachine builds registration into onboarding as a guided self-serve flow — your AI answers calls from day one, and outbound texting switches on when carriers approve, usually within days.