SMS & Compliance
What Is A2P 10DLC? Business Texting Registration Explained
A2P 10DLC is the U.S. carrier system that requires businesses to register their brand and messaging campaigns before sending texts from regular 10-digit numbers. Here's what it is and why it exists.
Quick Answers
What is A2P 10DLC?
A2P 10DLC stands for 'Application-to-Person, 10-Digit Long Code.' It is the framework U.S. mobile carriers use to sanction business text messaging sent from standard 10-digit phone numbers. Businesses must register their brand and describe their messaging campaigns; in exchange, carriers deliver their messages at higher throughput instead of filtering them as spam.
Is A2P 10DLC registration mandatory?
Yes, for any business sending application-driven SMS to U.S. numbers over long codes. Unregistered traffic faces aggressive carrier filtering, per-message surcharges, and can be blocked entirely. Registration is done through your messaging provider (for example Twilio) and involves brand verification and campaign approval.
How long does A2P 10DLC approval take?
Brand registration is often approved within minutes to days if business details match official records (EIN, legal name, address). Campaign approval typically takes from a few days up to a few weeks, depending on use case and vetting. Mismatched business data is the most common cause of delays and rejections.
Why carriers created A2P 10DLC
For years, businesses sent automated texts over ordinary local numbers with no oversight, and spam exploded. U.S. carriers responded by splitting traffic into P2P (person-to-person) and A2P (application-to-person) and requiring every A2P sender to identify itself. The result is a registry: carriers know which business is sending, what kind of messages, and with what consent — and they reward registered senders with reliable delivery.
The three layers of registration
- •Brand: your legal business identity — name, EIN, address — verified against official records.
- •Campaign: a description of what you send (appointment reminders, customer care, marketing) with sample messages and opt-in/opt-out details.
- •Numbers: the specific 10-digit numbers attached to the approved campaign.
What happens if you don't register
- •Carriers filter or block your messages — often silently, with no error returned.
- •Per-message carrier surcharges are higher for unregistered traffic.
- •Persistent unregistered sending can get numbers or accounts suspended.