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Sending SMS

Essential guides to creating, editing, and managing impactful text messages with Reply.
2 articles

Application-to-Person (A2P) SMS Registration Requirement

Due to recent regulatory and industry updates for bolstering trust in application-to-person (A2P) SMS messaging, Reply users utilizing SMS now need to register for A2P 10DLC to continue texting. This requirement is set by all significant U.S. telecom carriers and isn't limited to just Reply or our messaging partner, Twilio. Beginning August 31, 2023, all texts to U.S. numbers using standard 10-digit formats must come from a registered A2P campaign. Messages sent without registering after this date will face increasing block rates, culminating in a complete block. Before starting ensure you: - Are a registered business with a Tax ID/EIN. - Can publicly verify the authorized representative as an organization employee. - Have a consent mechanism for recipients before messaging. Registration Currently, in Reply, only manual registration is available. Automatic registration will be introduced in upcoming releases, and we'll keep you updated. We offer assistance with your registration and have the capability to register you manually. Customer success will reach out to you to register your brand and campaign. | It is critically important to gather all the info required to complete the steps in the meantime so materials can be submitted as soon as the options become available. | | --- | | Step | Action | Details | | --- | --- | --- | | 1 | Set up a business profile | Twilio will review this in 5-7 weeks. | | 2 | Create a brand | | | 3 | Initiate a campaign | | Note: Each step requires approval by our messaging provider, Twilio. For updates on approval status, please check messages from our Support team. Information Checklist You can collect and organize the necessary information in any manner that's easy for you to access and enter, like copy-pasting into a web form. While there's no need for formal documentation, every piece of information is essential. Please refer to the provided examples for guidance. Business Profile - Business Name - Physical Address (Street, City, State/Province/Region, Postal Code, Country) - Business Type (Sole Proprietorship/Partnership/Corporation/Co-Operative/LLC/Non-Profit) - Company Type (Private/Public) - Stock Ticker & Exchange (if Public) - Business Registration Number and Type – For A2P 10DLC registration, you must provide your Tax ID / EIN - Industry - Website - Regions of Operations - Authorized Representative (Note: Authorized representatives must be publicly verifiable employees of your company) - Last name - First name - Email - Title - Job position - Phone number Brand - Company type (Private, Public, US Non-Profit, US Government) - Stock Ticker & Exchange (if Public) Campaign 1. Campaign Description - Describe campaign objectives. (Ensure clarity on customer opt-in.) - If where and how the customer provides opt-in is unclear, the campaign will be rejected. | Examples | | --- | | GOOD: This campaign communicates with customers who registered on our website [link to website] to learn more about our new products. Through these messages, we gauge the best times to call them. | | POOR: This campaign messages customers to arrange calls regarding our new product range. | 2. Sample Messages Two (2) sample messages are required. Sample messages should reflect actual messages to be sent under the campaign. Guidelines for composing sample messages: - Do not use placeholder text for your sample messages. - Use brackets to indicate templated fields in the sample message. - Be consistent in sample message, use case, and campaign description. - Provide Opt-out when applicable. 3. Message content Will messages contain the following information? (YES/NO) - Embedded links - Phone numbers 4. How do end-users consent to receive messages? Describe how and when consumers opt-in to the campaign, therefore giving consent to the sender to receive their messages. The call-to-action must be explicitly clear and inform consumers of the nature of the program. If multiple opt-in methods can be used for the same, list them all. Be sure to: - Provide a website where opt-in occurs. - List all opt-in methods. - Ensure any provided website is accessible, with a privacy policy and terms. If where and how the customer provides opt-in is unclear, the campaign will be rejected. | Examples | | --- | | GOOD: Customers opt-in either online when signing up on our website or in-store by asking for SMS notifications. Online opt-ins happen through acme.com/signup. By opting in, you grant ACME permission to send promotional texts. Standard message/data rates may apply. Agreeing to receive messages isn't mandatory for purchases. [Link to terms and conditions] | | POOR: Customers sign up. | Opt-in Insights A robust opt-in system might be a website signup for message reception, encompassing: - Program description, sender identity. - Fee notice, frequency of messages. - Support contact, opt-out guide. - Privacy Policy and Terms of Service links. - A clear checkbox for SMS agreement. Adhere to CTIA guidelines and consult your legal team when necessary. More Guidance For added insights, check out Twilio's A2P Campaign Approval Best Practices. FAQs - Why is Reply implementing this when another platform isn't? Wireless carriers like AT&T, T-Mobile, Verizon, and others mandate these requirements to combat spam. All messages via the A2P system need registration. This registration necessity applies to all SMS platforms using A2P 10DLC. - Can I use another business registration number instead of EIN? Only EINs are valid for A2P 10DLC. - How do I automate opt-out language in Reply texts? Currently, manual insertion is required. Always include opt-out details. - Which words trigger opt-outs? STOP, UNSUBSCRIBE, END, QUIT, HALT - Does opting out in Reply stop all texts? It blocks texts to a specific number. Manually opt-out prospects to block all messages. - My registration was declined. What next? Contact our Customer Support.

Last updated on Oct 15, 2026

SMS Inbox page overview

The SMS Inbox page allows you to access and manage all SMS replies from your contacts. It brings all conversations from different sequences into one view, so you can respond and keep communication organized. This page is useful when you receive multiple SMS replies and need a simple way to review and respond without losing context. To learn more about how to send SMS from the Reply app or how to add SMS step to a sequence, read our support articles. You can open the SMS Inbox page from the left menu in Reply. You will also receive a notification in the Notification Center whenever a contact replies via SMS. Clicking the notification or the contact name will take you directly to the relevant conversation in the SMS Inbox. The page has two main areas: - Contacts list (left side): Shows contacts who replied via SMS, including their name, email, profile image (if available), and the date and time of the last message. The list is sorted from the newest to the oldest replies. - Message thread (main area): Displays the full conversation. Your sent messages appear on the right, and contact replies appear on the left. Links in messages open in a new browser tab. Each message includes a timestamp. To send a reply: 1. Type your message in the input field. 2. Press Enter or click the Send message button. 💡 Note that before sending, each SMS goes through processing checks. If a check fails, you will see an error message and need to fix the issue before sending. Managing conversations and limitations You can remove a conversation thread if needed. To delete a thread: 1. Open the conversation. 2. Click the Remove dialog button in the upper-right corner. This will remove the contact and conversation from the list. If the contact sends a new SMS later, the thread will appear again. 💡Note: - Deleting a thread removes it from the Inbox but does not block future messages from the contact. - The maximum length of a single SMS is 160 characters. Messages longer than this will be sent as multiple SMS parts.

Last updated on Oct 22, 2026