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• AT&T was the first major carrier to begin blocking unregistered traffic and has been the most aggressive enforcer.
• T-Mobile followed with filtering and blocking rules that increase in severity as the deadline approaches.
• Verizon similarly announced phase-out timelines for unregistered A2P traffic.

Once all major carriers enforce the block, unregistered messages sent from 10DLC numbers will either be silently dropped or returned with an error code. There is no grace period beyond the stated deadlines.

Who Is Affected?

Any business using 10-digit long codes to send text messages to customers, prospects, or users in the United States is affected. This includes:

• Marketing and promotional campaigns — SMS blasts, discount alerts, event invitations
• Transactional messages — appointment reminders, order confirmations, shipping notifications
• Customer support — two-way conversational SMS with customers
• Notification systems — alerts, system status updates, operational messages
• Authentication and verification — OTP codes, 2FA messages

If you're using an SMS API provider or CPaaS platform to send messages, check with your provider to confirm whether your numbers are registered and whether your campaigns are compliant.

What Happens If You Don't Register?

The consequences of remaining unregistered are severe:

1. Message blocking: Carrier filters will block your messages before they reach recipients. Your sends may appear successful in your platform, but recipients never see them.
2. Delivery rate collapse: Even before full blocking, unregistered campaigns have seen dramatic declines in delivery rates as carrier filters become more aggressive.
3. No recourse: Once blocked, unregistered campaigns have no appeal pathway with carriers. Registration is the only cure.
4. Revenue impact: For businesses that depend on SMS for customer engagement, order notifications, or authentication, message blocking can have immediate and material revenue consequences.

How to Register Your 10DLC Campaign

The registration process involves two components:

1. Brand Registration

You must first register your business as a brand with The Campaign Registry (TCR). This involves:

• Business name and legal entity information
• EIN (Employer Identification Number) for U.S. businesses
• Contact information
• Business type and industry vertical

Brand registration is a one-time process per business entity and typically costs a small one-time fee (often $4–5).

2. Campaign Registration

After registering your brand, you register individual messaging campaigns. A "campaign" in 10DLC terms is a specific use case for your messaging — for example, "customer appointment reminders" or "promotional marketing." Each campaign requires:

• Use case selection (e.g., marketing, transactional, authentication, 2FA)
• Sample messages (at least 2 examples of real messages you'll send)
• Campaign description
• Opt-in and opt-out documentation — how users consent to receive messages and how they can stop them
• Message frequency and volume estimates

Campaign registration fees vary by use case and are typically charged monthly (around $10/month per campaign for standard use cases).

3. Number Association

Once your campaign is registered and approved, you associate your 10DLC phone numbers with the campaign. Each number can only be associated with one campaign at a time.

Telnyx's 10DLC Registration Process

Telnyx makes 10DLC registration straightforward through the Mission Control Portal and API.

Through the Mission Control Portal:

1. Navigate to Messaging → 10DLC Registration
2. Create a brand profile by entering your business information
3. Submit the brand for TCR vetting (usually completed within 24–48 hours)
4. Create a campaign under your verified brand, selecting the appropriate use case
5. Add sample messages and opt-in/opt-out language
6. Associate your Telnyx numbers with the approved campaign

Through the Telnyx API:

Telnyx's Messaging API supports programmatic 10DLC registration, making it easy to integrate into existing workflows for developers managing number fleets at scale. The API endpoints cover brand creation, campaign creation, number assignment, and status monitoring.

Telnyx's vetting support: Telnyx provides documentation, support resources, and hands-on assistance to help customers navigate the registration process, including guidance on use case selection and sample message best practices that improve approval rates.

Best Practices for a Smooth Registration

• Register early. Don't wait until messaging stops working. Registration can take several days to weeks depending on your use case and any additional vetting required.
• Use clear opt-in language. Carriers scrutinize opt-in documentation carefully. Make sure your registration clearly explains how customers consent to receive messages (web form, SMS keyword, verbal consent at point of sale, etc.).
• Match sample messages to your actual content. The sample messages you provide during registration should be representative of what you'll actually send. Sending messages outside your registered use case can result in campaign suspension.
• One campaign per use case. Don't try to route all your messaging through a single campaign if you have multiple distinct use cases. Register separate campaigns for marketing, transactional, and authentication traffic.
• Monitor delivery rates post-registration. After registration, track your delivery rates to confirm improvement. If you see ongoing issues, contact your CPaaS provider for routing troubleshooting.

The Bottom Line

Unregistered 10DLC is ending, and the consequences of inaction are immediate and significant. Registration is not optional — it's the price of admission for legitimate business text messaging in the United States. The good news: the process is manageable, costs are modest, and the payoff is reliable, high-deliverability messaging that carriers trust.

Telnyx supports the full 10DLC registration workflow, from brand creation to number association, through both the Mission Control Portal and the Messaging API. Get started with 10DLC registration on Telnyx to ensure your SMS campaigns continue to reach your customers without interruption.

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