A2P 10DLC Registration Guide: Complete Walkthrough for Businesses (2025)

A2P 10DLC registration is now mandatory for businesses sending Application-to-Person SMS in the United States. Having successfully registered 500+ brands across all risk categories, I've seen what works—and what causes rejections.

This guide will walk you through the entire registration process, from understanding what 10DLC is to getting your campaigns approved and operational.

What is A2P 10DLC and Do You Need It?

A2P (Application-to-Person) messaging refers to automated messages sent from applications to consumers. This includes order confirmations, appointment reminders, marketing campaigns, and two-factor authentication codes.

10DLC (10-Digit Long Code) is a standard US phone number (10 digits) registered specifically for A2P messaging. Unlike short codes or toll-free numbers, 10DLC numbers look like regular phone numbers.

Do you need it? Yes, if you're sending automated SMS to US recipients. Carriers require registration through The Campaign Registry (TCR) to prevent spam and ensure compliance.

Understanding the Registration Process

Two-Step Registration

Step 1: Brand Registration

Register your business entity
Provide EIN (Employer Identification Number) or SSN for sole proprietors
Submit business documentation
Receive trust score (0-100)
Approval time: 2-3 business days typically

Step 2: Campaign Registration

Register specific use cases for messaging
Provide sample messages
Specify message types (transactional, promotional, mixed)
Approval time: 1-7 business days depending on complexity

Trust Score Explained

Your brand receives a trust score (0-100) that determines:

Throughput limits: How many messages per minute you can send
Vetting tier: Standard, Special, or Low-Volume
Approval likelihood: Higher scores = faster approval

Trust Score Tiers:

75-100: High trust, 4,500+ messages/minute
50-74: Medium trust, 240 messages/minute
Below 50: Low trust, 50 messages/minute

Step-by-Step Registration Guide

Step 1: Gather Required Documents

For Standard Businesses:

EIN (Employer Identification Number)
Business registration documents
Proof of business address
Website URL
Business description

For Sole Proprietors:

SSN (Social Security Number) or EIN
Business license (if applicable)
Proof of identity
Business address verification

For International Brands:

Equivalent business registration documents
US business entity (may be required)
Tax identification number
Local business address

Step 2: Brand Registration

Access TCR Platform through your SMS provider
Enter Business Information:
- Legal business name
- EIN/SSN
- Business address
- Website URL
- Industry classification
Submit Documentation:
- Business registration certificate
- Proof of address
- Tax documents
Wait for Approval: Typically 2-3 business days
Receive Trust Score: Check your score and throughput limits

Step 3: Campaign Registration

Define Use Case:
- Transactional: Order confirmations, shipping updates
- Promotional: Marketing campaigns, offers
- Mixed: Combination of both
Provide Sample Messages:
- Include actual message content
- Show opt-out language
- Demonstrate compliance
Specify Message Volume:
- Estimated monthly volume
- Peak sending times
- Message frequency
Submit for Approval: 1-7 business days

Common Rejection Reasons and Solutions

Rejection: Use Case Too Vague

Problem: "We send messages to customers" is too generic.

Solution: Be specific. "We send order confirmation messages within 5 minutes of purchase, including order number, items purchased, and shipping address."

Rejection: Sample Messages Flagged as Promotional

Problem: Transactional campaign includes promotional content.

Solution: Separate transactional and promotional campaigns. Keep transactional messages purely informational.

Rejection: Insufficient Documentation

Problem: Missing or unclear business documents.

Solution: Provide clear, legible copies of:

Business registration
Tax identification documents
Proof of address
Business license (if required)

Rejection: Low Trust Score

Problem: Brand receives trust score below 50.

Solution:

Improve business documentation
Establish business history
Work with provider to appeal
Consider low-volume exemption

Cost Breakdown

Brand Registration: $4/month recurring fee Campaign Registration: $10/month per campaign Low-Volume Exemption: Free (under 2,000 messages/day)

Total Monthly Cost Example:

1 brand + 2 campaigns = $24/month
1 brand + 5 campaigns = $54/month

Case Studies

Case Study 1: E-commerce Standard Registration

Situation: Shopify store with 50,000 customers needed 10DLC for order notifications and marketing.

Timeline:

Day 1: Started brand registration with EIN
Day 3: Brand approved, trust score 75
Day 5: Campaign registered for transactional messages
Day 8: Fully operational at 4,500 messages/minute

Documents Used: EIN, business registration, website verification Cost: $14/month (1 brand + 1 campaign) Lessons: Clear use case descriptions speed approval

Case Study 2: Crypto Platform (High-Risk)

Situation: Cryptocurrency exchange needed 10DLC for 2FA messages.

Challenges:

Rejection 1: Use case description too vague
Rejection 2: Sample messages flagged as promotional

Solution:

Specific use case: "Two-factor authentication codes sent when users log in or perform sensitive account actions"
Pure transactional messages only
Enhanced documentation

Final Result: Trust score 50, throughput 240 messages/minute, approved after 3 attempts

Case Study 3: Sole Proprietor

Situation: Freelance marketer without EIN needed 10DLC for client campaigns.

Approach: Used SSN for registration, provided business license and proof of identity

Result: Trust score 60, approved in 4 business days, $14/month cost

Improving Your Trust Score

Factors That Increase Trust Score:

Established business history
Complete documentation
Clear business purpose
Professional website
Positive carrier history

Factors That Decrease Trust Score:

New business (less than 6 months)
Incomplete documentation
High-risk industry classification
Previous compliance issues

Low-Volume Exemption

Eligibility: Sending fewer than 2,000 messages per day

Benefits:

No brand registration fee
No campaign registration fee
Simplified approval process
Faster setup

Limitations:

Lower throughput limits
Must stay under daily limit
Requires monitoring

FAQ

Q: How long does registration take? A: Brand registration: 2-3 business days. Campaign registration: 1-7 business days depending on complexity.

Q: What documents do I need? A: EIN (or SSN for sole proprietors), business registration, proof of address, and business license if applicable.

Q: Why was my brand rejected? A: Common reasons include vague use cases, insufficient documentation, or compliance concerns. Review rejection details and resubmit with improvements.

Q: How much does 10DLC registration cost? A: $4/month for brand registration, $10/month per campaign. Low-volume exemption is free.

Q: Can I use 10DLC for marketing messages? A: Yes, register a promotional campaign. Ensure proper opt-in compliance.

Q: What happens if I don't register? A: Messages may be blocked, filtered, or subject to lower throughput limits. Registration is now mandatory for A2P messaging.

Q: How do I improve my trust score? A: Provide complete documentation, establish business history, maintain compliance, and work with your provider on appeals.

Conclusion

A2P 10DLC registration is essential for businesses sending automated SMS in the US. While the process can seem complex, following this guide and working with an experienced provider makes it straightforward.

Key Takeaways:

Start with brand registration (2-3 days)
Register campaigns for each use case
Be specific in use case descriptions
Provide complete documentation
Monitor your trust score and throughput limits

Begin registration early to avoid delays when you need to send messages. Most businesses complete the process within 1-2 weeks.

A2P 10DLC Registration: Complete Guide 2025