What is 10DLC registration, really?
A 10-digit number does not become a business channel until the carriers say so. This is what 10DLC registration covers, how US A2P 10DLC registration works end to end, and how the platforms actually differ once you are registered.
What is 10DLC registration?
10DLC registration is how you tell US carriers who is sending a text and why, so they will deliver it. "10DLC" is simply a 10-digit long code — an ordinary local number — and A2P means application-to-person: any message your software sends to a customer.
The confusion starts because registration is not one step. It is two, and they are filed in order:
- Brand — your legal business, verified against your EIN
- Campaign — the use case you are sending, with sample messages and your opt-in flow
Both go to The Campaign Registry (TCR) through your SMS platform. You never talk to TCR directly, which is why your provider's filing interface matters more than most people expect.
How US A2P 10DLC registration works
US A2P 10DLC registration applies to any message delivered to a US phone number, regardless of where your business is based. A company in London texting American customers needs it exactly as much as one in Ohio.
Once your brand clears vetting you receive a trust score. That score is not cosmetic — it sets your 10DLC throughput, meaning how fast you may send. A low score does not block you; it throttles you, which is a slower and more confusing failure to diagnose.
Worth knowing: the carriers now block unregistered A2P traffic outright rather than filtering a portion of it. If your texts stopped arriving entirely rather than gradually, registration is the first thing to check.
Where platforms actually differ
Every platform files to the same registry against the same carrier rules. Nobody can sell you faster approval or a better trust score — those are set upstream. What genuinely differs is the filing experience, how failures are surfaced, whether numbers are portable, and what you pay on top of the pass-through fees.
That is the honest basis for comparison, and it is what the platform matrix sets out.
From number to delivered message
The order carriers expect, and what each stage actually gates.
File the brand
Legal name, EIN and address, matched against IRS records. A trading name that differs from the filed name is the most common vetting failure.
File the campaign
Use case, real sample messages, opt-in evidence. Vague samples get rejected — submit the message you will genuinely send.
Attach numbers
Link your 10DLC phone number set to the approved campaign. Throughput then ramps as the carriers build confidence.
Questions people actually ask
Yes, if you send application-to-person messages to US numbers from a 10-digit long code. The rule is about the traffic type, not your volume or your location — ten messages a month still counts.
Not directly. Every platform submits to the same registry against the same rules. What changes is how clearly the platform guides your filing and surfaces rejection reasons, which affects how many attempts you need.
An ordinary 10-digit local number attached to an approved campaign. There is no special class of number to buy — the registration, not the number, is what makes it deliverable.
Usually yes, but registrations do not always travel with them. Re-file on the new platform before porting, and keep the old campaign live until the new one is approved to avoid a delivery gap.