A2P 10DLC Registration
& SMS Compliance
Everything you need to know about registering your phone numbers, maintaining compliance, and sending SMS through Flo.
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What is A2P 10DLC?
A2P 10DLC is a phone number registration process mandated by United States carriers through The Campaign Registry (TCR). Any business or individual sending outbound SMS messages to U.S. recipients must complete registration.
A2P
Application to Person
The application (Flo) sends messages to a recipient (your client).
10DLC
10 Digit Long Code
Standard local business phone numbers used for SMS messaging.
TCR
The Campaign Registry
The organization responsible for managing business messaging registration.
"The purpose of A2P registration is to reduce spam, improve message deliverability, and help carriers identify legitimate businesses."
How A2P Registration Works
Brand Registration
Businesses must verify who they are with carrier networks. This involves providing official business details, tax IDs, and contact information.
Campaign Registration
Businesses must declare what types of messages they send. This includes providing sample messages, explaining use cases, and showing opt-in proof.
Note: Registration is completed directly through your Flo Phone System Trust Center.
The Registration Process
Brand Registration
Submit business information for review. Brand approval is required before campaign review can begin.
Campaign Registration
Submit details about your SMS messaging activities, opt-in methods, and intended use cases.
Carrier Propagation
After approval, carriers require additional time to receive and distribute your registration information.
Important Notice
Even after approval, some messages may temporarily fail while carrier networks update. This is normal and can take several business days.
Registration Timelines
Standard Local Number
3-10 Business Days
Average approval timeframe
Toll-Free Registration
3-10 Business Days
Average approval timeframe
Flo Recommendation: Register a Toll-Free number first, then submit your local number registration. This often allows businesses to begin sending messages sooner.
Avoid Failures & Speed Up Approval
Flo does not participate in the approval process after submission. However, accurate and complete submissions significantly improve approval speed.
Submission Checklist
What is a Campaign Use Case?
A campaign use case represents the type of messages your business sends.
A business that sends login verification codes and marketing promotions should register two campaign use cases because the messaging purposes are completely different.
Campaign Types Explained
Authentication
Verification and security codes.
Notifications
Appointment reminders and account alerts.
Customer Care
Support and service-related communications.
Marketing
Promotions, offers, and business announcements.
Social & Community Updates
News, events, and engagement messaging.
Your selected campaign type may affect registration costs, approval requirements, and messaging throughput.
Frequently Asked Questions
Get answers to common compliance questions.
Need Help?
If you need assistance completing your A2P registration, the Flo team is here to help guide you through the process.