This article provides comprehensive best practices for registering 10DLC (Ten-Digit Long Code) to send SMS messages in the United States via AWS End User Messaging.

• 10DLC is for Application-to-Person SMS in the US only, requiring company and campaign registration
• Register through AWS console or SMS V2 API; follow company info best practices for approval
• Ensure company name matches email/website domains and provide active support contact details
• Public profit companies must complete brand verification email process from Campaign Registry
• Optional brand vetting ($40 fee) increases carrier throughput quotas beyond default limits
• Campaign registration requires clear descriptions, terms/conditions, privacy policy, and opt-in workflow
• Opt-in must include brand name, T&C link, privacy policy link, frequency, care info, opt-out details
• Provide exact opt-in confirmation, help, and stop messages complying with carrier requirements
• Sample messages must reflect actual content, include brand name, and align with use case
• Abandoned cart messages require double opt-in and additional privacy/terms requirements

Proper registration following these practices ensures smooth approval and compliance with carrier requirements for SMS campaigns.