Twilio Long Code vs Toll-Free vs Short Code Compared

Choosing the right phone number type for your Twilio SMS program is one of the most consequential early decisions you will make, because migrating between number types requires re-registering your campaigns, porting or replacing numbers, and updating all your opt-in workflows. The three main options for US business SMS are 10-digit long codes requiring A2P registration, toll-free numbers requiring toll-free verification, and short codes requiring a separate provisioning process. Each has different throughput limits, compliance requirements, costs, and use case suitability.

10-Digit Long Codes with A2P 10DLC

Long codes are standard 10-digit US phone numbers costing $1.15 per month on Twilio and usable for business SMS after completing A2P 10DLC registration: brand registration with The Campaign Registry at approximately $4 one-time fee and campaign registration at approximately $15 per campaign per month. Registered long codes support throughput of up to 75 SMS segments per second for most campaign types, which is sufficient for most transactional and conversational use cases. Long codes support two-way messaging, making them the natural choice for conversational SMS, appointment reminders, customer support, and transactional notifications where customers may reply. The 10DLC registration process takes one to two weeks for standard brand registration.

Toll-Free Numbers with Toll-Free Verification

Toll-free numbers with 800, 888, 877, 866, 855, 844, and 833 prefixes cost $2.15 per month on Twilio and require toll-free verification before high-volume sending. Verified toll-free numbers support throughput of up to 3 SMS segments per second, lower than registered long codes but acceptable for most use cases. The toll-free verification process involves submitting use case documentation, opt-in flow details, and sample messages to Twilio for carrier review, with approval typically taking two to four weeks. Toll-free numbers can receive both calls and texts, making them useful for businesses that want a single number for both voice and text contact. The lower throughput limit makes toll-free numbers unsuitable for high-volume bulk sending but appropriate for transactional messaging and customer service.

Short Codes for High-Volume Sending

Short codes are 5 or 6-digit numbers that support throughput of up to 100 SMS segments per second, the highest throughput of any number type available on Twilio. Short code provisioning takes six to twelve weeks and costs $500 per month for a random short code or $1,000 per month for a vanity short code, plus a one-time setup fee. Short codes are best suited for one-directional bulk sending and cannot be used for voice calls. The high monthly cost and long provisioning time make short codes appropriate only for very high-volume applications: bulk marketing campaigns, emergency alerts, two-factor authentication at scale, and any use case sending more than a few thousand messages per hour. Most businesses do not need a short code and are better served by registered long codes.

Which Number Type Should You Choose

Choose a registered long code for most transactional SMS, customer service, appointment reminders, and conversational messaging use cases where two-way communication matters and throughput requirements are below 75 segments per second. Choose a toll-free number if you want a single number that handles both inbound calls and inbound texts, or if your brand identity benefits from the toll-free prefix, and throughput below 3 segments per second is sufficient. Choose a short code if you are running high-volume marketing campaigns, sending two-factor authentication codes to millions of users, or operating emergency alert systems that require guaranteed throughput above what long codes support. Our team helps clients assess peak throughput requirements, compliance timeline, and budget to make the correct number type selection before launch.

Conclusion

The right number type depends on your throughput needs, compliance timeline, budget, and whether you need two-way messaging. Getting this wrong at launch costs significant time and money to remediate. Contact our team before you provision numbers and we will help you choose correctly from the start.