What is A2P 10DLC?

Notice - Update, March 29:
Twilio is pushing back our April 1, 2021 Trust Hub registration start date. The previously announced June 1, 2021 deadline for registered traffic is no longer in effect. We are partnering with carriers on a phased onboarding approach to provide all customers ample time to register. We will provide an updated registration timeline and guidance on April 21, 2021.

T-Mobile’s carrier fees for registered traffic only will begin April 1, 2021. Twilio will cover these costs until May 1, 2021. We will gradually migrate registered customers to T-Mobile A2P 10DLC routes to ensure high reliability and deliverability of U.S. SMS traffic. You will experience no disruption during the transition. Unregistered traffic to T-Mobile will not incur carrier fees until registered and migrated to the new A2P 10DLC route.

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.

A2P 10DLC will launch on both AT&T and T-Mobile in 2021, with new registration requirements for businesses who intend to send long code messages to AT&T in the US.

Twilio is partnering with carriers on a phased onboarding approach for all customers who send long code traffic to the US, to ensure you have the time and guidance needed to complete registration.

Starting May 1, 2021, AT&T carrier fees will also go into effect on all Twilio messages to AT&T subscribers. T-Mobile’s carrier fees for registered traffic only will begin April 1, 2021; these T-Mobile fees will not apply to your messages until you are fully onboarded to A2P 10DLC.

Verizon previously launched their own A2P 10DLC solution in early 2019 and is not impacted by these new changes.

What do I need to do?

If you do not send messages to users in the United States using long code numbers, you do not need to do anything. If you are a business sending messages in the US, read on.

For now, please begin collecting the information you will need to complete registration – for a list, see How do I register to use A2P 10DLC messaging?

This information will be used register your Brand(s) and Campaigns when A2P registration is available. This will be available via both the Twilio Console and via API.

If you are a hobbyist, independent developer or very small business, you may not need to register. We will communicate updates as we have them.

Read on for details of the rules and requirements under the new A2P 10DLC registration system, and answers to many anticipated questions.

Article contents:

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?

Do I need to register? If so, what’s the deadline?

As of March 25, 2021, Twilio and carriers have partnered on a phased onboarding approach for all customers, rather than setting a hard start date and deadline for registration.

Dates and deadlines for business registration

April 1, 2021:

T-Mobile's fees for registered traffic only will begin April 1, 2021. Twilio will cover these fees until May 1, 2021. At this point, only a very small minority of Twilio customers will have been onboarded to T-Mobile's A2P 10DLC solution.

April 21, 2021:

Twilio will communicate more details around the timeline for registration on this date.

May 1, 2021:

T-Mobile's carrier fees for registered traffic only ($0.003/segment for outbound and inbound SMS, and $0.01 for outbound and inbound MMS) will begin passing-through to customers. Any customers who have been onboarded by this date will begin to see these fees on messages to T-Mobile.

AT&T’s carrier fees will begin for all customers, at a fixed cost of $0.002 per outbound SMS segment and $0.0035 per outbound MMS segment. Twilio will pass these fees on to our customers with no additional markup.

These AT&T carrier fees will remain in effect for all message traffic until AT&T's transition period for onboarding ends, at which point AT&T's full fee schedule goes into effect.

We are collaborating on a new registration deadline and will provide at least 60-day notice before the transition period officially ends. During the transition, there will be no additional filtering or blocking of your traffic. 

End of AT&T transition period - date TBD:

AT&T's Campaign-based fee schedule goes into effect for messages to users on AT&T's network.  The per-message fees associated with of unregistered SMS and MMS to AT&T increases. AT&T fees will vary from $0.002 to $0.004 per outbound SMS segment and $0.0035 to $0.005 per outbound MMS depending on your use case.

After the transition period ends, AT&T will increase filtering (blocking) of non-registered 10-digit long code traffic sent to users on their network.

What if I am just testing, or sending a very low volume of messages to the US?

If you are a hobbyist, independent developer, or a very small business, you do not need to complete any registration at this time. If any specific thresholds or new requirements arise, Twilio will share information with you via email and update this FAQ.

What happens if I don't register?

As of March 25, 2021, the June 1, 2021 deadline is no longer in effect. Twilio and carriers have partnered on a phased onboarding approach for customers.

Ultimately, registration is a requirement for businesses sending messages to the United States using 10-digit long code numbers. Non-registered message traffic will be subject to heavier message filtering. However, at this time there is no deadline announced – Twilio and carriers want to give customers ample time to make this transition without negative effects. We will update this article when further details exist.

We do not expect the increased message filtering to be a problem for independent developers and small businesses sending small volumes of message traffic. Twilio and carriers are committed to ensuring this type of traffic remains possible. However, the increased filtering will have a negative impact on delivery of messages for larger business use cases sending higher volumes.

We expect that some of you may wonder whether they would be considered a hobbyist or a small business, based on your current message volume to the US. As of today, we don't have specific thresholds from carriers to determine this. Please stay tuned as we will update this information as soon as more specific guidance is available.

How does Brand registration work? 

When you complete your A2P Profile (Brand Registration), The Campaign Registry will give your Brand a Trust Score of either Low, Medium, or High Trust. This rating influences the maximum message throughput that will be allocated to each of your Campaigns (see below).

What is a Trust Score, and how does it affect me?

When you complete the registration of your Brand and Campaign(s) for A2P Messaging through the Twilio Console, that information is sent from Twilio to The Campaign Registry (TCR), a 3rd party at the center of this new registration system. TCR uses a reputation algorithm to review specific criteria relating to your company, and assign a “Trust Score” that will determine your messaging throughput.

How do Trust Scores influence message throughput?

Trust Scores are grouped into three levels, from lowest to highest. Your Trust Score level, combined with your Campaign Type, will determine the message throughput that is allocated to your Campaign.

For details, see Message throughput (MPS) and Trust Scores for A2P 10DLC in the US.

What’s a Campaign?

A Campaign represents a use case. Some companies may only need one Campaign, in other cases you may have multiple. For example, if you are a company that sends authentication codes to validate new users, but you also send marketing messages, you should register two Campaigns.

When I register my Campaign, I have to select a Use Case. What do these mean?

Your Campaign Use Case describes the type of messaging you plan to send. This will influence the price you pay per message on AT&T.

Use cases vary from notifications and fraud alerts to customer care to social updates. For a full list of campaign use cases, please see: List of Campaign Types and Use Case Types for A2P 10DLC registration

Do I need to go directly to The Campaign Registry or any other non-Twilio website to complete registration?

No. Registration can be completed entirely through Twilio. Twilio has integrated directly with The Campaign Registry (TCR) to facilitate registration for our customers. This offers you other benefits of Twilio’s Trust Hub.

Twilio is currently evaluating support for companies who wish to complete Brand and Campaign registration outside of Twilio by going directly to TCR. Please note that, in any case, the ability to register with TCR is limited to ISV-type customers, per TCR and carrier rules.

Twilio will update this article when we have further information for ISV-type customers seeking to register directly with TCR.

Do I need to buy new phone numbers to use this A2P 10DLC service?

If you are already using long code numbers, there is no need to buy new numbers. You will enable your existing numbers to use the new A2P 10DLC service by following the registration process.

See also: How do these rule changes affect short codes and Toll-Free numbers? Should I switch to 10DLC?

My company provides services to multiple other brands or companies as an ISV (independent software vendor). What do I have to do?

If your company is an ISV, you will need to register your own Business Profile and Brand, then register each of your client Brands and Campaigns. Twilio is currently working on ways to make this process as smooth as possible for ISV customers, especially those with many clients.

First, you’ll register your own company as a Primary Business Profile in the Trust Hub on your primary Twilio account.

Your clients will each be registered as a Secondary Business Profile via Trust Hub. Their respective Brands and Campaigns will be registered through the same A2P Messaging process.

Twilio will provide further updates to our ISV customers, including draft documentation for registration APIs that are slated to go live in March.

We understand that onboarding to A2P 10DLC may be a significant effort if you are an ISV with a large number of clients. Once registration goes live, we recommend you start by registering your clients’ Brands and Campaigns with the highest message volume, and work your way down to smaller clients over time.

See also: How do I register to use A2P 10DLC messaging?

What information is required for registration?

In order to register businesses, brands and campaigns, you will need information about each business and brand. The required info includes the business name, physical address, business type (LLC, partnership, etc.).

For a complete list of information needed to register, see How do I register to use A2P 10DLC messaging?

Once I have registered my Brand and Campaign, how do I make sure my phone numbers use 10DLC?

Once your Brand(s) and Campaign(s) are approved, you will need to link each of your A2P Campaigns to a Messaging Service, and add phone numbers to that Messaging Service. Any numbers that you add to that Messaging Service will be automatically associated with the Campaign that you linked to that Messaging Service.

If you make this change today in advance of the changes, please ensure that your inbound message configuration (e.g. the webhook for your application) is applied on your Messaging Service. The inbound configuration settings of a Messaging Service currently takes precedence over the existing inbound settings on those numbers. Twilio plans to offer an optional setting to change this behavior to ease the transition, and will update this article with the details.

Do I need to change the way I send outbound messages?

If you don’t currently use Messaging Services in your application to send outbound messages, that’s OK – you won’t need to make changes within your application. It is not required to modify your application to include the Messaging Service SID in your API requests. It is only necessary to add the phone numbers to a Messaging Service, in order to associate them with a Campaign.

What pricing and fees are associated with the A2P 10DLC service?

For an overview of A2P 10DLC pricing, registration, and carrier fees please see 

What pricing and fees are associated with the A2P 10DLC service?

How long does it take to get registered?

When you initially submit your Business Profile in the Twilio Trust Hub, it will be reviewed within 72 hours. This review is completed by Twilio. You can do this initial step in advance of A2P registration opening up, if you choose.

As Twilio rolls out our phased approach to A2P registration, we expect that Brand and Campaign registrations submitted through Twilio will typically be approved within 1 hour.

Is MMS messaging affected by A2P 10DLC?

Yes. However, for high-volume MMS use cases in the United States, a short code is still the best option. Long code MMS messaging remains subject to throughput limits, due to limited carrier capacity (see below).

What message sending throughput (MPS) do I get?

Message throughput (MPS) will be allocated per registered Campaign. For many customers, A2P 10DLC will offer much higher throughput than the traditional 1 MPS for long code messaging, without the requirement of using additional numbers to get higher throughput.

For details, see Message throughput (MPS) and Trust Scores for A2P 10DLC in the US.

How do these rule changes affect short codes and Toll-Free numbers? Should I switch to 10DLC?

These changes do not directly affect short codes and Toll-Free numbers, except for officially prohibiting shared short codes for all use cases except authentication codes. Details below.

Shared short codes will be banned, date TBD

Dedicated short codes are still a great way to send high-volume A2P messaging in the United States. However, the use of shared short code numbers is being formally banned by AT&T effective June 1. The only exception to this policy is shared short codes used to send 2-factor auth (2FA) or OTP codes only.

“Shared short codes” refers to short code numbers that are shared among multiple brands, for example Shoe Company A and Beverage Company B sending messages via the same short code number. If you have purchased a short code number from Twilio and are using it for your own business and brand only, you are not affected by this change.

Under the new policy, a short code may be shared across multiple companies only for the purposes of sending authentication code messages, for example "Your login code is 12345." Any other category of messaging is not allowed on a shared short code.

Customers who are sharing a short code among multiple clients or brands for any purpose other than sending 2-factor codes (also known as OTPs) should completely migrate away from shared short codes.

Previously, the end date for shared short codes was identified as June 1. As of March 29, the end date for shared short codes is on hold until the successful implementation of A2P 10DLC. A specific date will be shared here when we have information to share.

Toll-Free SMS – no changes

US Toll-Free phone numbers are not affected by these changes. Toll-Free SMS is still a great way to send A2P SMS in the United States as well as Canada. See Information and best practices for using Toll-Free SMS in the US and Canada for more information.

Is there an API for registering Business Profiles, Brands, and Campaigns?

Currently, the registration process is manual through the Twilio Console. 

For customers (especially ISVs) who want to utilize APIs for Secondary Business Profile, Brand, and Campaign registration, we will have API documentation available in March. At that time, we will have additional information to share.

If you plan to use the API to register, we encourage you to go ahead and collect all the required information. See How do I register to use A2P 10DLC messaging? for a list.

Is Verizon making any changes to their existing A2P 10DLC service?

Verizon launched their A2P 10DLC service in January 2019. At this time, Verizon has not announced any plans to adopt these new Brand and Campaign registration requirements. If this ever occurs, Twilio will notify our customers in advance.

For now, Verizon’s A2P 10DLC service continues operating without changes. See the Verizon A2P 10DLC FAQ for details.

What about other mobile networks in the US?

T-Mobile is using the same registration system as AT&T. We will be sharing finalized details around T-Mobile's transition to A2P 10DLC in the near future, and updating this FAQ with complete details.

US Cellular (the 4th largest mobile carrier in the US) has not announced specific A2P 10DLC plans as of January 2021. Read on for details about other types of mobile networks.

Mobile Virtual Network Operators (MVNOs)

Many smaller branded mobile providers in the US are actually Mobile Virtual Network Operators (MVNOs), who utilize one or more of the major mobile networks for their service. A list of US MVNOs is available on Wikipedia. Any numbers on an MVNO who primarily utilizes AT&T's network will also be affected by these changes.

If you perform a Twilio Lookup on a mobile number operated by an MVNO, it will display the name of the primary host network (for example, AT&T or Verizon).

Other independent mobile networks

Small independent mobile networks in the US are a small percentage of the mobile market, and are not affected by upcoming A2P 10DLC changes. A list of mobile networks in the US who own and operate their own network infrastructure is available on Wikipedia for reference.

Is messaging to Canada or any other countries also affected by these changes?

No. Canadian mobile carriers may introduce registered A2P 10DLC solutions in the future, but at this time carriers have not announced any plans to do so.

For information about message sending in countries other than the US, we recommend checking out our country-specific SMS Guidelines pages to learn about any unique rules or restrictions in that country.

Is WhatsApp messaging affected by A2P 10DLC?

No. WhatsApp messaging is unaffected by any of these changes. WhatsApp messages are transmitted over the Internet, rather than through carrier networks like SMS and MMS.

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