A2P 10DLC

The name decodes into something simple. A2P means application-to-person: a business system texting a customer, rather than two people chatting. 10DLC means a 10-digit long code, which is an ordinary phone number rather than a short code or toll-free number. Put together: businesses texting customers from normal numbers.

Registration has two layers. You register your brand — your legal business name, tax ID, and contact details, which carriers check against public records — and then you register a campaign describing what you'll actually send: appointment reminders, order updates, marketing. You supply sample messages and explain how customers opt in. Carriers use that to assign your number a trust level, which determines how many messages per minute you're allowed to send.

Your phone provider handles the submission; you supply the information. Fees are small — a one-time brand fee, a campaign registration fee, and a modest monthly campaign charge — and vary by provider and campaign type.

Because unregistered business texting is being filtered out of existence. Carriers built this system to fight spam and illegal robotexts, and the enforcement is blunt: messages from unregistered numbers get heavily filtered or blocked outright, often silently. A business that skips registration doesn't get a warning — it gets customers who never received the appointment reminder.

The other reason it matters is timing. Registration takes days, sometimes longer when details need correcting, so it belongs at the start of a phone-system switch rather than the week you planned to launch texting. Businesses discover this constraint at the worst possible moment surprisingly often.