Overview Most Twilio channels require registration or approval before traffic flows. Skipping this step is the #1 onboarding mistake — developers build first, then discover messages are blocked or calls labeled as spam. Lifecycle: Choose numbers/senders ( ) → Register them (this skill) → Follow traffic rules ( ) --- Decision Tree: What Do I Need to Register? Messaging Programs | Sender type | Registration program | Timeline | Docs | |-------------|---------------------|----------|------| | US local (10DLC) | A2P 10DLC — brand + campaign | Brand: minutes. Campaign: 10-15 business days | Overvi…