Why Your SMS Delivery Failed and How A2P 10DLC Registration Fixes It

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A2P 10DLC is a carrier-enforced registration system in the US that requires developers to register their business and messaging use case before sending application-to-person SMS traffic over standard 10-digit phone numbers. The system is governed by a shared registry called The Campaign Registry and is not a law, but unregistered numbers face progressive filtering and eventual blocking by carriers. Registration involves three nested components — a Brand (legal entity), a Campaign (specific use case), and a Number — where the Brand's trust score determines overall message throughput, not the number of phone numbers assigned. Promotional SMS, where businesses initiate outbound messages to a list, faces the strictest scrutiny, while conversational traffic triggered by user actions is reviewed more leniently. Developers can reduce compliance friction by architecting their SMS flows so that outbound messages are responses to inbound user events rather than unsolicited broadcasts.

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