A2P 10DLC is a regulatory framework introduced by U.S. mobile carriers to legitimize and standardize A2P messaging using 10-digit long codes. It allows businesses to send compliant, high-volume text messages from local phone numbers.

Previously, businesses used short codes or toll-free numbers for A2P messaging. With 10DLC, they can now use familiar, local phone numbers—but they must register and be approved to do so.

A2P 10DLC registration only applies to U.S. local long code numbers (10-digit phone numbers with local area codes). It does not apply to:

✅ Carrier Approval – Reduce risk of filtering and improve delivery
✅ Regulatory Compliance – Avoid fines and ensure message transparency

✅ Local Presence – Use a phone number with an area code your customers recognize
✅ Higher Throughput – Send more messages per second compared to P2P
✅ Spam Protection – Helps preserve trust in SMS as a communication channel

Carriers introduced 10DLC to:

Verizon was the first to implement 10DLC, with AT&T and T-Mobile quickly following.

A long code is a standard 10-digit phone number (e.g., 555-123-4567). Originally, long codes were designed for person-to-person (P2P) communication—regular texting between individuals. This type of texting typically has lower volume, conversational flow, and fewer messages per second (MPS).

Examples of P2P texting:

Carrier networks generally allow P2P messaging at low volumes without special registration, but once message volumes rise or automation is involved, it's treated differently.

Application-to-Person (A2P) messaging refers to messages sent from a business application (like Salesmsg) to individuals. This includes:

Because of the potential for high-volume messaging and the risk of spam, carriers apply stricter rules to A2P traffic, especially when sent over long codes.

Salesmsg is a platform that enables businesses to send and receive text messages using local numbers. Since Salesmsg messages are typically:

They fall under A2P messaging and must be registered through the 10DLC system to ensure compliance, avoid filtering, and maintain message deliverability.

When you upgrade from a trial account on Salesmsg, you can:

If you choose a local 10-digit number, you will be prompted to register for 10DLC to ensure your texts are compliant.

Salesmsg makes the 10DLC registration process straightforward. You’ll need to provide:

Contact us on live chat or send an email to us at [email protected].