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Last updated: July 22, 2025

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Overview

If you’re planning to send business SMS messages in the US or Canada, you must complete A2P (Application-to-Person) 10DLC registration with Twilio. This guide walks you through filing a compliant campaign registration to avoid rejections and ensure your messaging gets approved.
Required for US & Canada: A2P 10DLC registration is mandatory before sending any application-generated messages to US or Canadian phone numbers. Start this process early as approval can take several weeks.

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What You Need Before Starting

Before beginning your A2P registration, ensure you have:
  • A registered business with Twilio
  • A clear opt-in process for collecting SMS consent
  • Compliant message samples
  • Privacy policy and terms of service
  • Screenshots of your consent forms

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Step 1: Set Up Compliant Opt-In Forms

Your lead form must meet Twilio’s strict requirements to ensure compliance.

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Required Elements

1. Clear Opt-In Language Use explicit language that explains what users are agreeing to receive: 
"Do you agree to receive SMS notifications about appointments and offers?"
☐ Yes, I agree to receive SMS messages from [Company Name]
2. Separate Consent Checkbox
Critical: Do NOT bundle SMS consent with Terms & Conditions or Privacy Policy. SMS consent must be a separate, unchecked checkbox.
3. Visible Policy Links Include direct links to your Privacy Policy and Terms of Service on the form. Your Privacy Policy must explicitly state:
“Mobile information will not be shared with third parties/affiliates for marketing/promotional purposes.”

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Form Checklist

  • Separate SMS consent checkbox (unchecked by default)
  • Clear description of what messages users will receive
  • Privacy Policy link visible on form
  • Terms of Service link visible on form
  • Privacy Policy includes third-party sharing language

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Step 2: Describe Your Opt-In Process

In the “How do end-users consent to receive messages?” section of your Twilio application, provide a clear description of your opt-in process.

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Example Description

Users opt in via our website [yourdomain.com] and provide explicit consent 
to receive SMS communications from our company through a separate, 
unchecked checkbox on our lead form.

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What to Include

Platform Details

Specify where opt-in happens (website, app, checkout page, etc.)

Consent Method

Describe how consent is collected (checkbox, form field, etc.)

Form Evidence

Provide either a direct link to your opt-in form OR screenshots

Supporting Documentation

Additional images or files that demonstrate your consent process

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Supporting Form Evidence for Your Application

When submitting your A2P campaign, you’ll need to provide evidence of your compliant opt-in process in this field of your Twilio application. This should be a link in the “How do end-users consent to receive messages?” field.

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Documentation to Include

  • Either screenshots of your complete opt-in form OR a direct link to the live form
File Sharing: Use a public file-sharing service like Google Drive, OneDrive, or Dropbox to host your documentation folder, then provide the link in your Twilio application.

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Step 3: Create Message Samples

You’ll need to provide two sample messages that represent the type of content you’ll send.

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Sample Message Guidelines

Conversational Tone

Write messages as if speaking to a friend or customer

Clear Purpose

Make it obvious why the recipient is receiving the message

Professional Content

Avoid excessive emojis or informal language

Relevant Links

Include only business-relevant URLs

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Example Messages

Message Sample #1: 
Hi [Name]! Your appointment is confirmed for tomorrow at 2 PM. 
Please arrive 5 minutes early. Looking forward to meeting you!
Message Sample #2: 
[Name], new time slots are now available! Book your session at 
our [location] by clicking here: https://yourlink.com

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Pre-Submission Checklist

Before submitting your A2P campaign, verify all requirements are met:

Opt-In Compliance

  • ☐ Separate SMS consent checkbox (unchecked by default)
  • ☐ Clear opt-in language explaining message types
  • ☐ Privacy Policy and Terms visible on form
  • ☐ Privacy Policy includes no third-party sharing clause

Message Samples

  • ☐ Two compliant message examples provided
  • ☐ Messages use conversational, professional tone
  • ☐ Content aligns with your business purpose

Documentation

  • ☐ Screenshots of opt-in form linked OR direct form link provided

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Next Steps

Once your A2P campaign is approved:

Start SMS Integration

Begin your SMS integration setup process

Configure Twilio Webhook

Set up your Twilio integration with Setter AI

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Need Help?

Technical Support

Contact support@trysetter.com for A2P registration questions
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