---
page_type: error
code: 30516
message: >-
  30516: Toll Free verification rejection - Double opt-in required for this use
  case
level: ERROR
product: Programmable Messaging
---

## Description

The Toll-Free phone number verification submission has been reviewed and it was rejected. Messaging traffic on this Toll-Free number is blocked until it's verified.

Verification is one component of ensuring A2P SMS is used by businesses in a legal and compliant manner. The review process looks at the business sending messaging (not the software powering it), the use case, sample content, the web presence, the opt-in/consent collected and associated website terms and privacy policies.

### Possible Causes

Your messaging use case requires a double opt-in process, but:

- Only a single opt-in was provided
- The double opt-in process was not documented
- The confirmation step was missing or incomplete

Double opt-in is required for certain use cases including shopping cart reminders.

### Possible Solutions

- Implement a double opt-in process for your specific use case

- Ensure the process includes:

  1. Initial opt-in (web form, keyword, etc.)
  2. Confirmation message asking user to confirm subscription
  3. User's affirmative response to complete enrollment

- Document the complete double opt-in flow in your submission

- Provide example messages for both steps of the double opt-in process

[Why was my Toll Free Verification Rejected?](https://support.twilio.com/hc/en-us/articles/9321443984155-Why-Was-My-Toll-Free-Verification-Rejected)

[Required information for Toll-free verification](https://support.twilio.com/hc/en-us/articles/13264118705051-Required-Information-for-Toll-Free-Verification)

[Toll-Free best practices](https://support.twilio.com/hc/en-us/articles/360038172934-Information-and-best-practices-for-using-Toll-Free-SMS-and-MMS-in-the-US-and-Canada)