# US A2P 10DLC, explained for international senders

> Sending application-to-person SMS to US numbers means brand and campaign registration, trust scores, and throughput tiers. What teams outside the US need to know.

- Canonical URL: https://www.broadnet.me/blog/us-a2p-10dlc-explained-for-international-senders
- Language: en
- Last updated: 2026-08-08
- Publisher: BroadNet (https://www.broadnet.me)

- Published: 2026-02-10
- Author: BroadNet Regulatory Affairs

The United States runs an A2P SMS regime that surprises teams used to alphanumeric sender IDs and aggregator-managed registration. There are no alphanumeric sender IDs for standard A2P in the US — you send from a number. And to send legitimate A2P traffic from a standard local number, you must go through 10DLC registration. If you are an international business messaging US customers, this is the part of US compliance most likely to trip you up.

## What 10DLC actually is

10DLC stands for 10-digit long code — an ordinary local US phone number sanctioned for application-to-person messaging. Before 10DLC, businesses sent A2P over consumer long codes that carriers tolerated but did not bless; deliverability was poor and unpredictable. 10DLC is the carriers' sanctioned framework: register your brand and your campaigns, get assigned a throughput tier, and in exchange receive a stable, carrier-approved path to subscribers.

## Two registrations, in order

- Brand registration — identifies your company via legal name, registered address, tax/business identifier, and contact details. International companies can register; expect to supply equivalent local business identifiers.
- Campaign registration — describes a specific messaging use case (OTP, marketing, notifications, customer care), sample message content, opt-in language, and the call-to-action through which users consent.
- Numbers are then associated with an approved campaign. Traffic before both registrations are approved is filtered or blocked by the carriers.

## Trust score and throughput tiers

Brand registration produces a trust score, influenced by how thoroughly your business identity can be verified by third-party vetting. The score drives your throughput tier — how many messages per second the carriers will accept from your numbers. A low score is not just a slow tier; it also raises the rate at which carrier filtering challenges your traffic. For higher-volume senders, additional brand vetting to lift the score is usually worth the effort.

## Alternatives — toll-free and short codes

10DLC is not the only US path. Toll-free numbers support A2P and have their own (lighter) verification process — a reasonable option for moderate volume, particularly OTP. Short codes — five or six digit numbers — offer the highest throughput and strongest deliverability but cost considerably more and take longer to provision. The decision tree: short code for very high volume or premium campaigns; 10DLC for typical local-presence A2P; toll-free as a quick-to-stand-up middle ground.

## Compliance obligations do not stop at registration

US A2P sits under TCPA and carrier rules: documented opt-in before the first message, an honoured opt-out (STOP and its variants), and content kept consistent with the registered campaign. Prohibited categories — the so-called SHAFT content, plus high-risk financial and other restricted verticals — are filtered regardless of registration. Registration grants you a path; it does not exempt you from consent and content rules.

> BroadNet manages US 10DLC brand and campaign registration, toll-free verification, and short-code provisioning for international customers — including guidance on which path fits your volume and use case.

## Plan the lead time

The most common mistake international senders make is treating US onboarding like an alphanumeric sender-ID market where you can be live in days. Brand and campaign registration, vetting, and number provisioning take real calendar time — plan for a few weeks, and longer for short codes. If a US launch has a fixed date, start the registration well before you would for a Gulf or European market.