What is 10DLC? Everything you need to know

What is 10DLC? Carrier-approved A2P SMS

Text messages have a 98% open rate, but that only matters if your messages actually reach your customers. With U.S. carriers blocking all unregistered 10DLC traffic as of February 1, 2025, businesses that haven't registered their messaging campaigns face a hard cutoff.

10DLC (10-digit long code) registration is now mandatory for any business sending application-to-person (A2P) SMS in the United States. Here's what you need to know to stay compliant and keep your messages flowing.

What 10DLC means for business messaging

10DLC refers to standard 10-digit local phone numbers that mobile network operators have approved for A2P messaging. Unlike traditional long codes, designed for person-to-person texting, 10DLC numbers can support moderately large volumes of business text messages after completing brand and campaign registration with The Campaign Registry (TCR).

The framework emerged to address a fundamental problem: businesses were sending bulk messages from numbers never designed for that purpose, creating compliance issues and delivery failures. 10DLC bridges the gap between expensive short codes and limited long codes, offering better throughput at lower costs.

With the SMS marketing industry reaching $12.6 billion by 2025 and growing at a 20.3% CAGR, the stakes for reliable message delivery have never been higher. Businesses that get registration right gain a competitive edge; those that don't risk service disruption.

How 10DLC registration works

Registration involves two steps: brand verification and campaign registration.

Brand registration verifies your business identity through details like company name, EIN, website, and contact information. Most brand registrations complete within two to three business days when information matches IRS records accurately.

Campaign registration follows brand approval. You'll describe your messaging use case, provide sample messages, and document how contacts have opted in. Each campaign receives a Trust Score from 0 to 100 that determines your throughput limits.

Most registrations complete within 3 to 7 business days with accurate information, though complex use cases requiring additional vetting may extend timelines. Telnyx customers benefit from a streamlined approvals process through Mission Control and self-serve APIs, reducing friction in getting campaigns live.

Throughput and trust scores

Your Trust Score directly impacts how many messages you can send. Registered 10DLC numbers achieve throughput 1 message per second per number.

Higher Trust Scores unlock greater throughput. Factors influencing your score include business verification status, campaign type, messaging history, and compliance record. Businesses can request enhanced vetting for higher scores. Telnyx provides vetting guidance to help align assets and improve approval rates.

For details on throughput rules and use cases, see the Telnyx 10DLC knowledge base.

10DLC vs. short code vs. toll-free

Choosing the right number type depends on your volume requirements, budget, and use case.

Short codes work best for ultra-high volume traffic like large-scale marketing blasts, but carry significant setup and maintenance costs. They also can't handle voice calls, limiting multi-channel communication.

Toll-free numbers support high-volume two-way SMS and offer branding opportunities through vanity number search. However, they may appear as international numbers to recipients, potentially affecting engagement.

10DLC hits the sweet spot for most businesses: local number recognition, voice capability, and cost-effective scaling. Companies can even convert existing landlines to 10DLC numbers, maintaining number continuity while gaining bulk messaging capacity.

For ISVs weighing options, this 10DLC vs. toll-free comparison breaks down the decision framework.

Why compliance matters now

Unregistered 10DLC traffic is ending permanently. Carriers have progressively increased pass-through fees for unregistered traffic and ramped up filtering before implementing full blocks. The February 2025 cutoff eliminates unregistered messaging entirely.

Beyond avoiding service interruption, 10DLC compliance delivers real benefits:

• Higher delivery rates: Pre-approved numbers bypass carrier filtering, ensuring messages reach recipients
• Increased customer trust: Verified sender status reduces spam flagging
• Better ROI: Businesses report $71 returns for every $1 spent on SMS marketing, but only when messages actually arrive

Carriers also enforce content restrictions. SHAFT content (sex, hate, alcohol, firearms, tobacco) triggers fines and potential campaign suspension, even for registered senders. The Telnyx compliance directory outlines requirements for maintaining good standing.

Getting started with 10DLC on Telnyx

Telnyx simplifies 10DLC registration through direct TCR integration. As a licensed carrier with global PSTN connectivity, Telnyx provides end-to-end control over numbering, messaging, and telephony, reducing handoffs and improving reliability.

The platform also enables unified workflows: send SMS on 10DLC, then trigger voice follow-ups with Voice AI Agents using the same numbers. This integration, backed by a private network and 24/7 engineering support, eliminates the complexity of managing multiple vendors.

Registration steps:

1. Audit current traffic – Identify any unregistered numbers
2. Register your brand – Submit business details through Mission Control
3. Register campaigns – Define use cases, sample messages, and opt-in methods
4. Assign numbers – Link approved campaigns to your 10DLC numbers

For a step-by-step walkthrough, follow the Telnyx compliance process guide.

Start reaching more customers

10DLC isn't optional, it's the baseline for reliable business messaging in the U.S. With carriers enforcing registration and filtering unverified senders, compliant businesses gain a clear delivery advantage.

Telnyx offers industry-leading 10DLC registration tools, competitive pricing, and comprehensive API support to get your campaigns live quickly. Contact our team to start the approval process and ensure your messages reach every customer.