How can we help?

Messaging Guidelines - Start Here with 10DLC 

A2P 10DLC Inception and Guidelines  

Beginning in 2020, Verizon, AT&T, T-Mobile, and other mobile network operators (MNOs) began launching their own 10DLC 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 to stop unwanted messages to consumer devices. This compliance measure is now referred to as A2P/10DLC (App to Person/10-Digit Long Code) and Toll-Free Message Verification, and it applies to all A2P messaging service providers throughout the US and Canada. Unlike other messaging compliance mandates that are regulated by the FCC, the A2P/10DLC initiative is regulated and managed by major MNOs, and this includes passing through non-compliance fines.  

The major MNOs appointed The Campaign Registry (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.  

Effective November 1st, 2021, the major MNOs Verizon, AT&T, and T-Mobile, along with their partner The Campaign Registry, implemented their A2P/10DLC initiatives, including the enforcement of penalty fines.  


10DLC Registration & Toll-Free Verification 

Important: Flowroute only supports Brands and Campaigns registered with TCR via Flowroute, and not those done directly with TCR by the customer. TCR non-recurring and recurring fees are passed through by Flowroute to the Customer on their monthly billing statement.  

To begin 10DLC Registration, go to the Preferences in your Manage portal, and look for “10DLC Registration”.  

Toll-Free message delivery is handled independently of TCR with a different process. Each Toll-Free number used for outbound messaging is required to complete a Toll-Free Messaging Verification Form.   

Our team is here to help you! If you have any questions about 10DLC, please email  


Related resources:

10DLC Messaging Submission FAQ