Reference

A2P 10DLC

The US carrier-mandated framework for sending automated SMS/MMS from standard local numbers. Register your brand and your campaigns in The Campaign Registry, or your traffic is blocked outright.

reference Last verified mid-2026 1 min read

A2P 10DLC is how a business earns the right to text US mobile subscribers from a standard 10-digit local number. Since February 1, 2025, unregistered 10DLC traffic is blocked 100% by AT&T, T-Mobile, and Verizon — there is no longer a “just start sending” option.

Registration is hierarchical. You register one Brand (your verified business identity), then one or more Campaigns (your message use cases), then attach phone numbers to each campaign. All of it flows through a CSP (Campaign Service Provider) such as Twilio, Telnyx, or Bandwidth — you cannot register directly with The Campaign Registry .

Brand            business identity, vetted → Trust Score, T-Mobile daily cap
 └── Campaign    use case: Marketing / 2FA / Account Notification / …
      └── Number(s)   attached at campaign level; AT&T throughput allocated here

One Brand can hold many Campaigns; one Campaign can hold many numbers (except Sole Proprietor, which is capped at one). Each carrier reviews and approves your campaigns separately.

The pages below are the working manual for getting through it.

referenceOverview

A2P 10DLC is the US carrier framework that requires businesses to register their identity and message types before automated SMS/MMS …

Open guideRegistration guide

The complete sequence to get a US brand qualified to text over 10DLC — create a customer profile, register your brand, optionally vet, …

Open guideBrand registration

Registering your Brand is the identity layer of 10DLC. Get the legal name, EIN, and authorized rep exactly right — mismatches here are …

Open guideCampaign registration

A Campaign tells carriers what you're sending and why. Get the use case, description, sample messages, and opt-in flow to all agree — …

Open guideSole Proprietor

The 10DLC path for individuals and small businesses without an EIN. Cheap and OTP-verified, but hard-capped at one campaign, one or two …

Open referenceTrust Score & throughput

Your Trust Score (0–100) sets how fast you can send. But each carrier translates it differently — T-Mobile caps per brand per day, AT&T …

Open referenceFees

Every fee in 10DLC — one-time TCR registration, brand vetting, per-campaign monthly charges, T-Mobile activation, and per-message …

Open referenceRejection reasons

Roughly 90% of 10DLC rejections trace to a handful of fixable gaps. Here's every common cause, its code, and the exact fix — before you …