What Is A2P 10DLC in Calilio?
A2P 10DLC is the US system that lets businesses send application-to-person messages from 10-digit local numbers. Calilio handles it on the A2P Messaging screen, which opens from Compliance under Settings, and registration runs in three stages: a customer profile, a brand, and a campaign.
Application-to-person messaging is any SMS or MMS your business sends from software rather than by hand, such as an appointment reminder or a delivery update. In the United States, mobile carriers ask for that traffic to be registered before it reaches anyone.
What the A2P Messaging screen shows you
- Onboarding explains A2P 10DLC and links out to the registration process.
- Profile holds your registered business details, with a Status column.
- Brand holds the entity you register, with a Brand Status column.
- Campaign holds your messaging use case, linked to a registered brand.
- Registered Numbers lists the Calilio numbers attached to a campaign.
A2P Messaging opens on Onboarding and carries five tabs.
Where do you find A2P Messaging in Calilio?
- Click Settings, then Compliance under WORKSPACE in the settings menu.
- A2P Messaging opens in a new browser tab, on a different address from the rest of the Calilio web app.
- The same screen is the first item in the sidebar of that tab, beside the Power Dialer.
Click Settings, then Compliance to open A2P Messaging.
Why do you need A2P 10DLC registration?
Calilio states the reason on the Onboarding tab: messages sent to the United States from a 10-digit long code have to go through an approved A2P campaign, and unregistered messages bound for the United States are blocked. The same panel notes that registering improves delivery quality and reduces the risk of your messages being filtered.
Who needs to register for A2P 10DLC?
Anyone sending SMS or MMS to United States numbers from a Calilio number needs to register, whether you run a company or work on your own. Registration is per workspace rather than per number, and the numbers you want to use are attached to the campaign at the end.
Can you send SMS before your A2P campaign is approved?
No, not to the United States. The Onboarding tab states that any unregistered message bound for the United States is blocked, so United States traffic waits on an approved campaign. Messaging to other countries is not covered by A2P 10DLC.
What are the available A2P campaign use cases?
The campaign form asks for one use case from a list named Available A2P Campaign use cases. On a workspace registering as a sole proprietor, that list offers Sole Proprietor, and Calilio's brand form offers the Sole Proprietor Brand type. Calilio describes that type as suited to testing, or to sending fewer than 3,000 message segments to the United States each day.
What A2P registration does not do
- It does not buy or verify a phone number. Buying a number and registering for A2P are separate tasks.
- It does not cover calls. A2P 10DLC applies to SMS and MMS.
- It does not apply outside the United States. The address and the verification number both have to be United States or Canadian.
Which plans include A2P 10DLC registration?
Every Calilio plan includes A2P 10DLC registration for the United States and Canada. Calilio charges it per attempt rather than bundling it into the Standard, Premium, or Enterprise plan, so the current charges are on the plan comparison.
Contact Calilio support
If your messages to the United States are not delivered after your campaign is approved, contact our support team with your workspace name, the number you sent from, and the destination number.
Related articles
References
How to register your business for A2P 10DLC | |
Plan-wise feature restrictions in Calilio | |
How to check call and message rates at Calilio | |
How to add a new phone number to your Calilio account | |
How to verify a USA virtual toll free number |
Updated on: 27/10/2026
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