A2P Instructions & Walkthrough
This page explains what you need to prepare for A2P registration, including business information alignment, website requirements, and proper SMS opt-in language. Following these steps helps ensure faster approval.
A2P Registration Best Practices
To activate SMS messaging, mobile carriers require clear, consistent business information and proof of proper customer opt-in. This page explains exactly how to prepare.
Business Information Must Match
All business details submitted during onboarding must align across your:
- Legal business name
- Website domain
- Brand name referenced in SMS messages
- Business contact information
Mismatched information is the #1 cause of A2P rejection.
Your Website Must Support SMS
Carriers review your website to confirm your business is real and matches the messaging use case.
- Active, public website (not parked)
- Services clearly explained
- Visible business contact details
If you purchase leads, messages must still be sent on behalf of your business, not the lead provider.
Opt-In Language Is Required
Customers must explicitly consent to receive SMS messages.
- Clear disclosure near the submit button
- Explanation of what messages are about
- Opt-out instructions (STOP)
Missing or vague opt-in language will delay approval.
Example: Proper Website Opt-In (ACME INC)
Below is a visual example of how TCPA-compliant SMS opt-in language should appear directly on your website form. This is what carriers expect to see.
If your domain and legal business name don’t match, add a website disclaimer
Mobile carriers check that the business registering for A2P is clearly tied to the website collecting the opt-in. If your website domain and your legal company name are different, you should add a simple ownership/operation disclaimer on your site (usually in the footer and/or Privacy Policy) so everything aligns.
Legal entity: Acme Co.