Introduction to 10DLC Registration
Since 2020, Verizon, AT&T, T-Mobile, and other Mobile Network Operators (further: MNOs) began launching their 10DLC (10-Digit Long Code) programs designated for business-to-consumer (aka "A2P" - Application-to-Person) messaging over local phone numbers. These programs were created by following guidelines found in Messaging Principles and Best Practices provided by the Cellular Telecommunications Industry Association (CTIA) with the intention of stopping unwanted messages to consumer devices. This compliance measure is now referred to as A2P/10DLC Registration and Toll-Free Verification (TF-V), and it applies to all A2P messaging service providers throughout the US and Canada. Unlike other messaging compliance mandates regulated by the FCC, the A2P/10DLC/TF-V initiatives are regulated and managed by major MNOs. This also includes the responsibility of message originators to bear any pass-through fines incurred due to non-compliance.
The major MNOs appointed The Campaign Registry (further: TCR) to manage the 10DLC registration initiative, with the requirement that each organization must register a Brand and Campaign with the TCR.  MNOs use the TCR’s verification and vetting process to determine campaign message throughputs. 
Some important milestones:
Effective November 1st, 2021, Verizon, AT&T, and T-Mobile, along with their partner TCR, implemented their A2P/10DLC initiatives, including penalty fines enforcement. 
Effective April 17th, 2024, Flowroute blocks all outbound messages from unregistered 10DLC numbers.
10DLC Registration Process
Important: Flowroute only supports Brands and Campaigns registered with TCR via Flowroute, not those done directly with TCR by the customer.
Where: To begin 10DLC Registration process, go to the Preferences in Flowroute Manage portal, and then navigate to the 10DLC Registration tab.
How: Flowroute Team outlined the key elements for successful Brand & Campaign approvals in this article: 10DLC Brand & Campaign Approval Essentials.
Webinar to help with 10DLC registration
To help you successfully register your 10DLC numbers Flowroute hosted the "10DLC Registration Training" webinar.
Topics covered in the webinar:
What is 10DLC and 10DLC Registration?
What is the difference between P2P and A2P messages and why does Flowroute only support A2P?
How to avoid mistakes and delays in the registration process
David Anandraj, our Product Manager at Flowroute, and the Communication Service Provider team guided messaging users through the steps and answered customer questions.
Related resources
[external] T-Mobile Messaging Code of Conduct
[external] CTIA Messaging Principles and Best Practices
[external] MMA Best Practices
[external] M3AAWG Best Practices
[external] Telephone Consumer Protection Act (TCPA) Omnibus Declaratory Ruling (FCC 15-72)
[external] FTC Truth in Advertising