# Registering A2P 10DLC in Twilio Canonical: https://warmtransfer.net/knowledge/twilio-a2p-10dlc-registration Last verified: 2026-10-14 Twilio requires A2P 10DLC registration for anyone sending SMS or MMS from an application to US numbers over a 10-digit long code, including individuals and hobbyists[^41]. Registration has two components: a Brand that describes who sends the messages, and a Campaign that describes the message purpose and how opt-in, opt-out and help requests are handled[^7]. ## Scope Toll-free numbers and short codes are outside the A2P 10DLC registration system on Twilio[^40]. Twilio blocks messages to US numbers that are sent from a +1 10DLC number with no approved A2P 10DLC Campaign, and logs error 30034[^22]. ## Choosing a Brand type | Brand type | Daily volume to T-Mobile | Campaigns | |---|---|---| | Sole Proprietor | 1,000 SMS segments and MMS, about 3,000 across US carriers[^43] | 1[^43] | | Low-Volume Standard | Up to 2,000 SMS segments and MMS, about 6,000 across US carriers[^33] | Up to 5[^33] | | Standard | 2,000 to unlimited SMS segments and MMS, depending on Trust Score[^51] | Up to 5[^25] | Standard and Low-Volume Standard Brands require a Tax ID[^54]. Each Tax ID can register up to 5 such Brands, and exceeding this without a valid business reason can cause Campaign rejection in manual vetting[^54]. For these Brand types, Twilio accepts the business types Co-operative, Corporation, LLC, Non-profit Corporation and Partnership[^50]. Government organizations must use the Non-profit Corporation business type with the GOVERNMENT industry[^27]. Sole Proprietor Brand registration is only for US and Canadian customers without a tax ID[^45]. Customers outside the US and Canada must use a Standard or Low-Volume Standard Brand[^45]. A sole proprietorship that holds an EIN or Canadian Business Number should also register a Standard or Low-Volume Standard Brand, not a Sole Proprietor Brand[^44]. The Sole Proprietor OTP mobile number must be a US or Canadian mobile that was not acquired from a CPaaS provider[^46]. That number can be used at most 3 times across A2P Brand registrations, and TCR enforces this limit[^46]. Only 1 +1 10DLC number can be registered to a Sole Proprietor Campaign[^47]. Any additional numbers in its Messaging Service stay unregistered and are blocked with error 30034[^47]. The Low-Volume Mixed Campaign use case is for traffic under 2,000 segments per day on T-Mobile[^32]. It carries a lower monthly fee than Standard use cases[^32]. ## Fees Twilio charges a one-time $4.50 fee to register a Brand with The Campaign Registry[^12]. Standard Brand registration automatically incurs a one-time $41.50 Standard Brand vetting fee[^52]. Twilio lists an Authentication Plus fee of $12.50 per request, which applies only to public, for-profit Brands[^6]. Twilio also charges recurring monthly Campaign fees that cover creating and maintaining the Campaign record with The Campaign Registry[^17]. Twilio's US SMS pricing page states that US A2P 10DLC senders are subject to registration onboarding fees, but it does not list 10DLC fee amounts[^37]. ## Information to gather - **Brand contact email.** Since October 17, 2024, public for-profit Brands must supply a business brand contact email that is used for 2FA identity verification[^9]. This applies to new Brands and to existing Brands that create new Campaigns[^9]. A personal, free or distribution-list address causes Brand failure, and error 21740 flags an invalid domain such as gmail.com[^26]. - **Website.** The Brand website URL is screenshotted and evaluated automatically[^59]. It is rejected if it is unreachable, parked or for sale, login-gated, or redirects to an unrelated domain[^59]. - **Privacy policy.** The privacy policy must be publicly accessible without login and must state that mobile numbers are not shared[^38]. It must also disclose message frequency and include "message and data rates may apply"[^38]. - **Campaign text.** The Campaign description must be 40 to 4,096 characters, and the message flow (opt-in description) must be 40 to 2,049 characters[^15]. - **Message samples.** A Campaign requires 2 to 5 message samples of 20 to 1,024 characters each[^19]. Each sample must identify the brand and mark variable content in square brackets[^19]. ## Direct Console registration - **Create a Primary Customer Profile.** The first step is a one-time Primary Customer Profile in Trust Hub[^21]. You can skip it if the account already has one from another Twilio product[^21]. Twilio says approval may take 72 hours or more, and you can proceed to Brand registration while it is pending[^39]. - **Register the Brand.** When you register a Brand in the Console, Twilio submits the application to The Campaign Registry (TCR) for review[^14]. A Brand in IN_REVIEW status is under manual third-party review that Twilio says takes 7 business days or more, and no customer action is required[^11]. - **Add phone numbers.** Twilio instructs adding every phone number intended for A2P 10DLC messaging to the Messaging Service Sender Pool before submitting the Campaign[^2]. - **Register the Campaign.** A Messaging Service can be linked to only 1 A2P 10DLC Campaign at a time[^36]. Twilio's direct onboarding guide warns that Campaign review is currently taking 10 to 15 days, while its approval-process section says 2 to 3 weeks[^18]. - **Number registration.** When a Campaign is approved, all 10DLC numbers in the linked Messaging Service are registered for A2P 10DLC[^35]. Twilio states that this number registration is not instant and can be delayed or fail[^34]. WarmTransfer's reading of the sources is that a first-time direct Standard registration should be planned as a multi-week project, because profile review, Brand manual review and Campaign review are documented in sequence[^20]. ## ISV API registration Before registering customers through the ISV API, the ISV's parent account needs a Twilio Approved Primary Business Profile that uses the ISV Reseller or Partner business type[^29]. The API sequence, in order, is[^30]: - Secondary Customer Profile[^30] - A2P TrustProduct[^30] - BrandRegistration[^30] - A new Messaging Service[^30] - The Usa2p Campaign[^30] Brands are created with `POST https://messaging.twilio.com/v1/a2p/BrandRegistrations`, which requires CustomerProfileBundleSid and A2PProfileBundleSid[^8]. The BrandRegistration SkipAutomaticSecVet option is only for Low-Volume Standard Brands, 527 political organizations, or political organizations with a Campaign Verify token[^42]. Twilio's ISV API guide says not to create the Messaging Service or Campaign until the BrandRegistration status is APPROVED[^31]. The same guide advises contacting Support if a BrandRegistration stays IN_REVIEW for more than 2 days[^28]. Campaigns are created with `POST https://messaging.twilio.com/v1/Services/{MessagingServiceSid}/Compliance/Usa2p`, a resource that Twilio documents as for ISVs only[^57]. Creating a Usa2p Campaign requires BrandRegistrationSid, Description, MessageFlow, MessageSamples, UsAppToPersonUsecase, HasEmbeddedLinks and HasEmbeddedPhone[^58]. Deleting an approved Usa2p Campaign blocks all A2P 10DLC messaging from its Messaging Service until a new Campaign is created and approved by TCR, which can take several days[^56]. ## Status values The BrandRegistration status values are PENDING, APPROVED, FAILED, IN_REVIEW, DELETION_PENDING, DELETION_FAILED and SUSPENDED[^13]. The Usa2p campaign_status values are PENDING, IN_PROGRESS, FAILED and VERIFIED[^55]. ## Diagnosing failures **FAILED Brands.** The most common cause of a FAILED Standard or LVS Brand is a mismatch between Business Profile details, such as legal name or address, and the government tax registration[^10]. A FAILED Standard or LVS Brand can be resubmitted free up to 3 times[^23]. After that, a further API update returns HTTP 400 with error 21724[^23]. **SUSPENDED Brands.** A SUSPENDED Brand cannot be updated or used for new Campaigns (error 21731)[^53]. Its Campaigns cannot send (error 30033) and cannot have numbers added or removed (error 21729)[^53]. **Authentication+ 2FA errors.** Twilio documents these error codes[^5]: - 21736: domain not verified[^5] - 21737: 2FA expired[^5] - 21738: email undeliverable[^5] - 21739: failed or timed out[^5] - 21740: invalid domain[^5] - 21741: code expired[^5] **Failed Campaigns.** Twilio says Campaigns fail when the purpose, use case, workflow, or opt-in and opt-out methods are incomplete or inadequate, or when content violates registry policy[^16]. You can edit and resubmit a failed Campaign in the Twilio Console; API-based editing is in private beta[^24]. **Error 30034.** This error occurs when the sending number has no approved A2P 10DLC Campaign[^22]. It also occurs when the sending number is not in the Sender Pool of the Messaging Service linked to the approved Campaign[^1]. ## See also - [Business texting and 10DLC registration](https://warmtransfer.net/knowledge/business-texting-10dlc) - [Troubleshooting business SMS that is not delivered](https://warmtransfer.net/knowledge/business-sms-delivery-troubleshooting) - [Toll-free numbering and RespOrg](https://warmtransfer.net/knowledge/toll-free-numbering) ## Applicability Applies to: Twilio Programmable Messaging, Twilio Trust Hub, Twilio Messaging Services, and Twilio Messaging API. Deployments: multi-tenant. Sources checked 2026-10-14. The registration requirement covers sending to US numbers over a 10-digit long code[^41]. Toll-free numbers and short codes are excluded[^40]. The brand contact email requirement applies from October 17, 2024[^9]. The API endpoints described are under the v1 Messaging API[^8][^57]. The pricing page statement reflects the page as of October 2026[^37]. ## What remains uncertain How specific Trust Score values map to daily volume for a Standard Brand is not covered by the sources below. How long phone number registration takes after Campaign approval is not covered by the sources below. The dollar amounts of the monthly Campaign fees, including the Low-Volume Mixed fee, are not covered by the sources below. ## Sources [^1]: Error 30034 also occurs when the sending number is not in the Sender Pool of the Messaging Service linked to the approved Campaign. Source: [30034: US A2P 10DLC - Message from an Unregistered Number](https://www.twilio.com/docs/api/errors/30034), 'Possible causes'. Checked 2026-10-14. [^2]: Twilio instructs adding every phone number intended for A2P 10DLC messaging to the Messaging Service Sender Pool before submitting the Campaign. Source: [Direct Standard and Low-Volume Standard Registration Guide](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/direct-standard-onboarding), Step 4 'Set up the Messaging Service and add phone numbers'. Checked 2026-10-14. [^3]: Twilio's Standard/LVS Brand troubleshooting guide states appeal-based manual re-vetting carries a $10 fee in addition to normal brand submission fees (disputed). Source: [Troubleshooting A2P 10DLC Standard/LVS Brands](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/troubleshooting-a2p-brands/troubleshooting-and-rectifying-a2p-standardlvs-brands), section 'Resubmitting Standard/LVS Brands'. Checked 2026-10-14. [^4]: Twilio's Brand Registration page lists a Brand appeal fee of $11 per request, applicable only to Standard Brand vetting rejections (disputed). Source: [A2P 10DLC Brand Registration](https://www.twilio.com/docs/trust-hub/registrations/a2p-10dlc-brand), section 'Brand fees', row 'Brand appeal'. Checked 2026-10-14. [^5]: Twilio documents Authentication+ 2FA error codes 21736 (domain not verified), 21737 (2FA expired), 21738 (email undeliverable), 21739 (failed or timed out), 21740 (invalid domain) and 21741 (code expired). Source: [Troubleshooting A2P 10DLC Standard/LVS Brands](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/troubleshooting-a2p-brands/troubleshooting-and-rectifying-a2p-standardlvs-brands), section 'Troubleshooting Authentication+ 2FA verification failures'. Checked 2026-10-14. [^6]: Twilio lists an Authentication Plus fee of $12.50 per request that applies only to public, for-profit Brands. Source: [A2P 10DLC Brand Registration](https://www.twilio.com/docs/trust-hub/registrations/a2p-10dlc-brand), section 'Brand fees', row 'Authentication Plus'. Checked 2026-10-14. [^7]: A2P 10DLC registration has two registered components: a Brand describing who sends the messages and a Campaign describing the message purpose plus opt-in, opt-out and help handling. Source: [Programmable Messaging and A2P 10DLC](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc), section 'General A2P 10DLC registration steps'. Checked 2026-10-14. [^8]: Brands are created with POST https://messaging.twilio.com/v1/a2p/BrandRegistrations, which requires CustomerProfileBundleSid and A2PProfileBundleSid. Source: [A2P 10DLC - BrandRegistrations resource](https://www.twilio.com/docs/messaging/api/brand-registration-resource), 'Create a BrandRegistration', request body parameters. Checked 2026-10-14. [^9]: Since October 17, 2024, public for-profit Brands on Twilio must supply a business brand contact email used for 2FA identity verification, for new Brands and for existing Brands creating new Campaigns. Source: [Direct Standard and Low-Volume Standard Registration Guide](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/direct-standard-onboarding), Step 2, brand contact email note. Checked 2026-10-14. [^10]: The most common cause of a FAILED Standard or LVS Brand is a mismatch between Business Profile details such as legal name or address and the government tax registration. Source: [Troubleshooting A2P 10DLC Standard/LVS Brands](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/troubleshooting-a2p-brands/troubleshooting-and-rectifying-a2p-standardlvs-brands), Brand status list, FAILED; 'Resubmitting Standard/LVS Brands'. Checked 2026-10-14. [^11]: A Brand in IN_REVIEW status is under manual third-party review that Twilio says takes seven business days or more, with no customer action required. Source: [Direct Standard and Low-Volume Standard Registration Guide](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/direct-standard-onboarding), Step 2, Brand status list, IN_REVIEW. Checked 2026-10-14. [^12]: Twilio charges a one-time $4.50 fee for registering a Brand with The Campaign Registry. Source: [A2P 10DLC Brand Registration](https://www.twilio.com/docs/trust-hub/registrations/a2p-10dlc-brand), section 'Brand fees', row 'Brand registration'. Checked 2026-10-14. [^13]: The BrandRegistration status values are PENDING, APPROVED, FAILED, IN_REVIEW, DELETION_PENDING, DELETION_FAILED and SUSPENDED. Source: [A2P 10DLC - BrandRegistrations resource](https://www.twilio.com/docs/messaging/api/brand-registration-resource), 'BrandRegistration Properties', status. Checked 2026-10-14. [^14]: When a Brand is registered in the Twilio Console, Twilio submits the application to The Campaign Registry (TCR) for review. Source: [Direct Standard and Low-Volume Standard Registration Guide](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/direct-standard-onboarding), Step 2 'Register a Standard or Low-Volume Standard Brand'. Checked 2026-10-14. [^15]: A Twilio Campaign description must be 40 to 4,096 characters and the message flow (opt-in description) 40 to 2,049 characters. Source: [Gather the Required Business Information for A2P 10DLC](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/collect-business-info), section 'Campaign details', description and message flow. Checked 2026-10-14. [^16]: Twilio says Campaigns fail when purpose, use case, workflow, or opt-in and opt-out methods are incomplete or inadequate, or when content violates registry policy. Source: [Troubleshooting A2P 10DLC Registrations](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/troubleshooting-a2p-brands), section 'Troubleshoot and fix A2P Campaign submission failures'. Checked 2026-10-14. [^17]: Twilio charges recurring monthly Campaign fees that cover creating and maintaining the Campaign record with The Campaign Registry. Source: [A2P 10DLC Campaign Registration](https://www.twilio.com/docs/trust-hub/registrations/a2p-10dlc-campaign), section 'Campaign fees'. Checked 2026-10-14. [^18]: Twilio's direct onboarding guide warns that Campaign review is currently taking 10 to 15 days, while its approval-process section says two to three weeks. Source: [Direct Standard and Low-Volume Standard Registration Guide](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/direct-standard-onboarding), Step 3 warning callout and 'approval process' section. Checked 2026-10-14. [^19]: A Twilio Campaign requires two to five message samples of 20 to 1,024 characters each that identify the brand and mark variable content in square brackets. Source: [Gather the Required Business Information for A2P 10DLC](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/collect-business-info), section 'Campaign details', message samples. Checked 2026-10-14. [^20]: A first-time direct Standard registration on Twilio should be planned as a multi-week project, because profile review (72h+), brand manual review (7+ business days if IN_REVIEW) and campaign review (10-15 days) are documented in sequence (inferred). Source: [Direct Standard and Low-Volume Standard Registration Guide](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/direct-standard-onboarding), Steps 1-3 timing statements. Checked 2026-10-14. [^21]: In Twilio's direct Console flow the first step is a one-time Primary Customer Profile in Trust Hub, which can be skipped if the account already has one from another Twilio product. Source: [Direct Standard and Low-Volume Standard Registration Guide](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/direct-standard-onboarding), Step 1 'Create a Primary Customer Profile'. Checked 2026-10-14. [^22]: Twilio blocks messages to US numbers sent from a +1 10DLC number not associated with an approved A2P 10DLC Campaign, logging error 30034. Source: [30034: US A2P 10DLC - Message from an Unregistered Number](https://www.twilio.com/docs/api/errors/30034), Description. Checked 2026-10-14. [^23]: A FAILED Standard or LVS Brand can be resubmitted free up to three times; a further API update returns HTTP 400 with error 21724. Source: [Troubleshooting A2P 10DLC Standard/LVS Brands](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/troubleshooting-a2p-brands/troubleshooting-and-rectifying-a2p-standardlvs-brands), 'Resubmitting Standard/LVS Brands', Updating an A2P Brand Using the API. Checked 2026-10-14. [^24]: A failed Campaign can be edited and resubmitted in the Twilio Console, while API-based editing is in private beta. Source: [Troubleshooting A2P 10DLC Registrations](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/troubleshooting-a2p-brands), section 'Troubleshoot and fix A2P Campaign submission failures'. Checked 2026-10-14. [^25]: A Standard or Low-Volume Standard Brand on Twilio can have up to five Campaigns. Source: [Direct Standard and Low-Volume Standard Registration Guide](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/direct-standard-onboarding), Step 3 'Register a Campaign and associate a Messaging Service'. Checked 2026-10-14. [^26]: Using a personal, free or distribution-list email as the brand contact email causes Brand failure; Twilio error 21740 flags an invalid domain such as gmail.com. Source: [Gather the Required Business Information for A2P 10DLC](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/collect-business-info), section 'Business details', brand contact email. Checked 2026-10-14. [^27]: Government organizations registering A2P 10DLC on Twilio must use the Non-profit Corporation business type with the GOVERNMENT industry. Source: [Gather the Required Business Information for A2P 10DLC](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/collect-business-info), section 'Business details', government and nonprofit note. Checked 2026-10-14. [^28]: Twilio's ISV API guide advises contacting Support if a BrandRegistration stays IN_REVIEW for more than two days. Source: [ISV Standard and Low-Volume Standard Registration via API](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/onboarding-isv-api), Step 3 notes. Checked 2026-10-14. [^29]: Before registering customers via the ISV API, the ISV's parent account needs a Twilio Approved Primary Business Profile using the ISV Reseller or Partner business type. Source: [ISV Standard and Low-Volume Standard Registration via API](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/onboarding-isv-api), 'Before you begin', Create a Primary Business Profile. Checked 2026-10-14. [^30]: The ISV API sequence is Secondary Customer Profile, then A2P TrustProduct, then BrandRegistration, then a new Messaging Service, then the Usa2p Campaign. Source: [ISV Standard and Low-Volume Standard Registration via API](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/onboarding-isv-api), Steps 1.1-1.11, 2.1-2.6, 3, 4, 5. Checked 2026-10-14. [^31]: Twilio's ISV API guide says not to create the Messaging Service or Campaign until the BrandRegistration status is APPROVED. Source: [ISV Standard and Low-Volume Standard Registration via API](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/onboarding-isv-api), Step 4 and Step 5 cautions. Checked 2026-10-14. [^32]: The Low-Volume Mixed Campaign use case is for traffic under 2,000 segments per day on T-Mobile and carries a lower monthly fee than Standard use cases. Source: [Programmable Messaging and A2P 10DLC](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc), section 'Determine your Campaign use case type'. Checked 2026-10-14. [^33]: A Twilio Low-Volume Standard Brand may send up to 2,000 SMS segments and MMS per day to T-Mobile (about 6,000 across US carriers) and may have up to five Campaigns. Source: [A2P 10DLC Brand Registration](https://www.twilio.com/docs/trust-hub/registrations/a2p-10dlc-brand), section 'Brand types', Low-Volume Standard row. Checked 2026-10-14. [^34]: Twilio states that phone number registration begins after Campaign approval but is not instant and can be delayed or fail. Source: [Troubleshooting A2P 10DLC Registrations](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/troubleshooting-a2p-brands), section 'Troubleshoot Campaign phone number registration issues'. Checked 2026-10-14. [^35]: When a Campaign is approved, all 10DLC numbers in the linked Messaging Service are registered for A2P 10DLC. Source: [Direct Standard and Low-Volume Standard Registration Guide](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/direct-standard-onboarding), Step 4 'Set up the Messaging Service and add phone numbers'. Checked 2026-10-14. [^36]: A Twilio Messaging Service can be linked to only one A2P 10DLC Campaign at a time. Source: [Direct Standard and Low-Volume Standard Registration Guide](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/direct-standard-onboarding), Step 3 'Register a Campaign and associate a Messaging Service'. Checked 2026-10-14. [^37]: Twilio's US SMS pricing page (current as of October 2026) states that US A2P 10DLC senders are subject to registration onboarding fees but does not list 10DLC fee amounts. Source: [SMS pricing - United States](https://www.twilio.com/en-us/sms/pricing/us), SMS/MMS section and FAQ. Checked 2026-10-14. [^38]: Twilio requires the privacy policy to be publicly accessible without login, state that mobile numbers are not shared, disclose message frequency and include 'message and data rates may apply'. Source: [Gather the Required Business Information for A2P 10DLC](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/collect-business-info), section 'Campaign details', privacy policy. Checked 2026-10-14. [^39]: Twilio says Primary Customer Profile approval may take 72 hours or more and the customer can proceed to Brand registration while it is pending. Source: [Direct Standard and Low-Volume Standard Registration Guide](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/direct-standard-onboarding), Step 1 'Create a Primary Customer Profile'. Checked 2026-10-14. [^40]: Toll-free numbers and short codes are outside the A2P 10DLC registration system on Twilio. Source: [Programmable Messaging and A2P 10DLC](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc), section 'Who needs to register for A2P 10DLC?'. Checked 2026-10-14. [^41]: Twilio requires A2P 10DLC registration for anyone sending SMS or MMS from an application to US numbers over a 10-digit long code, including individuals and hobbyists. Source: [Programmable Messaging and A2P 10DLC](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc), section 'Who needs to register for A2P 10DLC?'. Checked 2026-10-14. [^42]: The BrandRegistration SkipAutomaticSecVet option is only for Low-Volume Standard Brands, 527 political organizations, or political organizations with a Campaign Verify token. Source: [A2P 10DLC - BrandRegistrations resource](https://www.twilio.com/docs/messaging/api/brand-registration-resource), 'Create a BrandRegistration', parameter SkipAutomaticSecVet. Checked 2026-10-14. [^43]: A Twilio Sole Proprietor Brand may have one Campaign and is limited to 1,000 SMS segments and MMS per day to T-Mobile (about 3,000 across US carriers). Source: [A2P 10DLC Brand Registration](https://www.twilio.com/docs/trust-hub/registrations/a2p-10dlc-brand), section 'Brand types', Sole proprietor row. Checked 2026-10-14. [^44]: A sole proprietorship that holds an EIN or Canadian Business Number should register a Standard or Low-Volume Standard Brand, not a Sole Proprietor Brand. Source: [Gather the Required Business Information for A2P 10DLC](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/collect-business-info), section 'Sole proprietors', Eligibility. Checked 2026-10-14. [^45]: Sole Proprietor Brand registration on Twilio is only for US and Canadian customers without a tax ID; customers outside the US and Canada must use a Standard or Low-Volume Standard Brand. Source: [ISV Sole Proprietor Registration via API](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/onboarding-isv-api-sole-prop-new), introduction, eligibility note. Checked 2026-10-14. [^46]: The Sole Proprietor OTP mobile number must be a US or Canadian mobile not acquired from a CPaaS provider and can be used at most three times across A2P Brand registrations, a limit enforced by TCR. Source: [ISV Sole Proprietor Registration via API](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/onboarding-isv-api-sole-prop-new), Step 2.3 caution and limits list. Checked 2026-10-14. [^47]: Only one +1 10DLC number can be registered to a Sole Proprietor Campaign; additional numbers in its Messaging Service stay unregistered and are blocked with error 30034. Source: [30034: US A2P 10DLC - Message from an Unregistered Number](https://www.twilio.com/docs/api/errors/30034), 'Possible causes' and 'Possible solutions'. Checked 2026-10-14. [^48]: For a Sole Proprietor Brand an OTP is sent to the customer's mobile number on Brand submission and the customer must respond within 24 hours, after which the OTP can be retriggered. Source: [ISV Sole Proprietor Registration via API](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/onboarding-isv-api-sole-prop-new), Step 2.3 caution; optional step 3.2. Checked 2026-10-14. [^49]: Sole Proprietor OTP verification must be completed within 30 days of Brand registration. Source: [ISV Sole Proprietor Registration via API](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/onboarding-isv-api-sole-prop-new), reference to step 3.1 in Section 2 notes. Checked 2026-10-14. [^50]: For Standard and Low-Volume Standard Brands Twilio accepts the business types Co-operative, Corporation, LLC, Non-profit Corporation and Partnership. Source: [Gather the Required Business Information for A2P 10DLC](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/collect-business-info), section 'Standard and Low-Volume Standard Brands', legal details. Checked 2026-10-14. [^51]: A Twilio Standard Brand's daily T-Mobile volume ranges from 2,000 to unlimited SMS segments and MMS depending on its Trust Score. Source: [A2P 10DLC Brand Registration](https://www.twilio.com/docs/trust-hub/registrations/a2p-10dlc-brand), section 'Brand types', Standard row. Checked 2026-10-14. [^52]: Standard Brand registration on Twilio automatically incurs a one-time $41.50 Standard Brand vetting fee. Source: [A2P 10DLC Brand Registration](https://www.twilio.com/docs/trust-hub/registrations/a2p-10dlc-brand), section 'Brand fees', row 'Standard Brand vetting'. Checked 2026-10-14. [^53]: A SUSPENDED Brand cannot be updated or used for new Campaigns (error 21731), and its Campaigns cannot send (error 30033) or have numbers added or removed (error 21729). Source: [Troubleshooting A2P 10DLC Standard/LVS Brands](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/troubleshooting-a2p-brands/troubleshooting-and-rectifying-a2p-standardlvs-brands), 'Brands with SUSPENDED status, and related Campaign suspensions'. Checked 2026-10-14. [^54]: Standard and Low-Volume Standard Brands require a Tax ID, and each Tax ID can register up to five such Brands; exceeding this without a valid business reason can cause Campaign rejection in manual vetting. Source: [Programmable Messaging and A2P 10DLC](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc), section 'Determine your Brand type'. Checked 2026-10-14. [^55]: The Usa2p campaign_status values are PENDING, IN_PROGRESS, FAILED and VERIFIED. Source: [A2P 10DLC - UsAppToPerson (Usa2p) resource](https://www.twilio.com/docs/messaging/api/usapptoperson-resource), 'Usa2p Properties', campaign_status. Checked 2026-10-14. [^56]: Deleting an approved Usa2p Campaign blocks all A2P 10DLC messaging from its Messaging Service until a new Campaign is created and approved by TCR, which can take several days. Source: [A2P 10DLC - UsAppToPerson (Usa2p) resource](https://www.twilio.com/docs/messaging/api/usapptoperson-resource), 'Delete a Usa2p resource'. Checked 2026-10-14. [^57]: Campaigns are created via the API with POST https://messaging.twilio.com/v1/Services/{MessagingServiceSid}/Compliance/Usa2p, a resource Twilio documents as for ISVs only. Source: [A2P 10DLC - UsAppToPerson (Usa2p) resource](https://www.twilio.com/docs/messaging/api/usapptoperson-resource), 'Create a Usa2p resource'. Checked 2026-10-14. [^58]: Creating a Usa2p Campaign requires BrandRegistrationSid, Description, MessageFlow, MessageSamples, UsAppToPersonUsecase, HasEmbeddedLinks and HasEmbeddedPhone. Source: [A2P 10DLC - UsAppToPerson (Usa2p) resource](https://www.twilio.com/docs/messaging/api/usapptoperson-resource), 'Create a Usa2p resource', request body parameters. Checked 2026-10-14. [^59]: The Brand website URL is screenshotted and evaluated automatically and is rejected if unreachable, parked or for sale, login-gated, or redirecting to an unrelated domain. Source: [Gather the Required Business Information for A2P 10DLC](https://www.twilio.com/docs/messaging/compliance/a2p-10dlc/collect-business-info), section 'Business details', website URL. Checked 2026-10-14.