A2P 10DLC Registration for Phone Numbers used to send SMS/MMS in Apps such as Twilio

  • 19 September 2023
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A2P 10DLC Registration for Phone Numbers used to send SMS/MMS in Apps such as Twilio


Unregistered A2P 10DLC phone numbers will be blocked from sending messages in the US after August 31, 2023.
Complete the registration process to avoid disruption in your message delivery.



A2P 10DLC registration overview

All major US carriers are requiring A2P 10DLC number registration.
Now, any SMS or MMS message you send to a US phone must go through an approved application-to-person (A2P) campaign.

To complete 10DLC registration, you'll need to complete the three following steps:

  1. Brand - Provide information about who is sending the messages.
  2. Campaigns - Register what is being sent for each of your use cases and how you'll manage customer consent.
  3. Numbers - Add the 10DLC phone numbers to be registered for that Campaign into a Messaging Service.


Notice: Shutdown of Unregistered 10DLC Messaging
• Effective September 1st, 2023, all SMS and MMS messages sent to U.S. phone numbers using +1 10DLC phone numbers must be sent via an approved application-to-person (A2P) campaign.
Messages sent to the U.S. using unregistered +1 10DLC numbers will be blocked.
Blocked messages will return error code 30034, “US A2P 10DLC - Message from an Unregistered Number”(Twilio messaging rates will still apply, even for blocked messages).
Please register your +1 10DLC numbers as soon as possible to avoid the impact. You may learn more about this from the Twilio website, and register via the Twilio Console or APIs.


What is A2P 10DLC?

A2P 10DLC refers to a system in the United States that allows businesses to send Application-to-Person (A2P) type messaging via standard 10-digit long code (10DLC) phone numbers.
Carriers in the US consider all Twilio traffic to be A2P. Carriers’ A2P 10DLC offerings provide better delivery quality and lower filtering risk than long code SMS of the past, using the same phone numbers.

Register now to benefit from improved deliverability and increased throughput in the new verified A2P 10DLC ecosystem. 


How does A2P 10DLC work?

There are two important requirements under the new A2P 10DLC system:

  1. Businesses must identify who they are to the carrier networks (Brand registration).
  2. Businesses must register what type of messages they are sending, i.e. notifications (Campaign registration). 

Registration is done entirely through Twilio’s Trust Hub.
We have integrated with The Campaign Registry (TCR) to meet the requirements of carriers, while making it easy for businesses to onboard. 

For additional guidance, please see How do I register to use A2P 10DLC messaging?

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