Application-to-Person messaging (A2P) is any kind of message traffic in which a person is receiving messages from an application. A2P messaging includes (but is not limited to) marketing messages, appointment reminders, chat bots or virtual assistants, notifications, and one-time passwords (OTPs) or PIN codes.
Wireless carriers treat P2P and A2P traffic differently in terms of the type and volume of traffic allowed. It is important to understand your use case so you can use the correct tools, such as phone numbers, short codes, or Alphanumeric Sender ID.
Learn more about the difference between A2P and P2P SMS.
"US A2P 10DLC" refers to a system in the United States that allows businesses to send A2P-type messaging via standard 10-digit long code (10DLC) phone numbers. Mobile carriers in the US consider all Twilio traffic to be A2P.
A2P 10DLC is the new standard for businesses to send messages in the United States. To build trust with mobile carriers, businesses register their brands and campaigns and benefit from high-volume, high-deliverability messaging over long codes.
Carriers in the United States and Canada have a strict interpretation of A2P, and consider all messaging that passes through Twilio (or other messaging application platforms) to be A2P.
For more detailed information on A2P 10DLC in the US, the registration process, fees, and benefits, please see our Support Article What is A2P 10DLC?