Note: A2P 10DLC registration is required for businesses sending SMS or MMS to US recipients using US 10-digit local phone numbers through Momence.
Overview
We’ve officially kicked off the migration of our first batch of US customers to complete their 10DLC registration and campaign setup.
What is US SMS 10DLC Registration and why do I need it?
10DLC (“10-digit long code”) refers to standard local US phone numbers used for A2P (application-to-person) messaging, such as business texts sent through software rather than a person typing on a phone.
Since the major carriers (AT&T, T-Mobile, Verizon) mandated registration, businesses must register their identity and the messages they send before using these numbers at scale. Carriers typically filter, throttle, or block unregistered traffic and may impose penalty fees.
In short, higher sending limits let you reach more people, and better compliance with carrier requirements reduces the risk of messages being flagged or blocked.
What are the costs?
Registration typically costs between $20 and $60. Momence is covering your registration fees if you register before the end of 2026.
How can I get started?
You'll see an "action required" banner in the top left of your dashboard. You'll also see one when attempting to compose a message in the marketing suite. Just click this link and follow the prompts.
You'll also receive weekly reminder emails to help you complete the process.
How can I ensure a high throughput?
Throughput (messages per second, minute, or day) depends on your brand’s trust score and the campaign use case. Higher vetting generally means higher limits, and carriers apply their own caps.
What are common reasons for rejection?
Brand details that don’t match official records (name, EIN, address)
A website that’s missing, unreachable, or doesn’t match the stated business
No visible privacy policy or terms, or no SMS consent language
Vague opt-in descriptions or no proof of consent
Sample messages that don’t match the declared use case
Prohibited or restricted content (e.g., illegal substances, high-risk lending), or shared or purchased lead lists
Broader Context / Best Practices
Who are the key players?
Mobile network operators (MNOs): AT&T, T-Mobile, Verizon. They set and enforce the rules.
The Campaign Registry (TCR): the central database where brands and campaigns are registered and vetted.
Your messaging provider (CSP): the platform you send through (Twilio, Bandwidth, Telnyx, etc.). They submit registrations to TCR on your behalf.
What are the three registration layers?
1. Brand registration (who you are)
Legal business name, entity type, and tax ID (EIN)
Business address, website, and contact details
Industry vertical
A sole proprietor path exists for individuals without an EIN, but it has strict volume limits.
Optional external vetting (e.g., via a TCR vetting partner) produces a trust score, which can significantly raise your throughput.
2. Campaign registration (what you send)
Use case: e.g., 2FA/OTP, account notifications, customer care, marketing, or mixed. Special use cases include charity, political, and emergency.
A plain-language description of the messaging
Sample messages that match real traffic
Opt-in/message flow: how and where people consent, with proof such as a screenshot or URL
Opt-out (STOP) and HELP handling
Declarations about embedded links, embedded phone numbers, age-gated content, and direct lending
3. Number assignment
Once the campaign is approved, you link your 10DLC numbers to it. Only numbers attached to an approved campaign should send traffic.