A2P 10DLC, short for Application-to-Person 10-Digit Long Code, is the industry framework that governs how businesses send SMS messages to US consumers using standard 10-digit phone numbers. Carriers including AT&T, T-Mobile, and Verizon enforce this framework to combat spam, and unregistered traffic is now subject to filtering rates as high as 30% of total volume with no advance notice. If your business sends any automated or bulk SMS on Twilio, registration is not optional.
What A2P 10DLC Actually Means
Traditional 10-digit long codes were originally designed for person-to-person messaging, not business campaigns. Carriers began restricting their use for business messaging after spam complaints reached unsustainable levels, leading to the A2P 10DLC framework managed by The Campaign Registry. Under this framework, businesses must register both their brand identity and the specific campaigns they intend to run before sending any traffic. Each registered campaign receives a trust score from 0 to 100 that directly controls throughput limits and carrier acceptance rates, with higher scores unlocking more messages per second and less aggressive filtering.
Who Must Register
Any business or developer using an application, API, or automation to send SMS messages from a 10-digit US phone number to US subscribers must complete A2P 10DLC registration. This covers appointment reminders, transactional alerts, two-factor authentication codes, marketing promotions, surveys, and customer care messages without exception. Carriers do not grant exemptions based on message volume, so a business sending 50 messages per month faces the same filtering risk as one sending 500,000. Sole proprietors without a formal legal entity must still register under the Sole Proprietor track, which carries tighter throughput limits but the same legal obligation.
The Three Components of Registration
A2P 10DLC registration involves three distinct steps that must all reach an Approved status before your traffic is protected. First, brand registration requires your legal business name, Employer Identification Number, business type, vertical, and contact information. Second, campaign registration requires a declared use case, two or three representative sample messages, and a clear description of how recipients opted in. Third, number assignment links your Twilio phone numbers to the approved campaign so carriers can validate that the sending number is operating under a registered use case. Missing the number assignment step is the most common oversight and leaves businesses confused when filtering continues despite having completed the first two steps.
Costs and Ongoing Fees You Should Budget For
Brand registration carries a one-time fee of $4 charged by The Campaign Registry through Twilio. Standard campaign registration costs a one-time $40 vetting fee plus a recurring $10 per campaign per month for as long as the campaign remains active. Low-Volume Standard campaigns cost less upfront but impose lower throughput limits, making them suitable only for very small-scale programs. Sole Proprietor campaigns limit you to 1 message per second with a hard daily cap of 1,000 messages and have their own lower fee schedule. These fees are entirely separate from Twilio per-message charges and phone number rental, so a complete SMS program budget must account for all three cost layers from day one.
Conclusion
A2P 10DLC registration is the single most important compliance step for any US business sending SMS on Twilio, and getting it wrong means paying for messages that never arrive. Speak with our compliance team and we will audit your current registration status and fix any gaps at no charge.
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