# 30440: Toll Free verification rejection - Unknown Error

Log Type: APPLICATION

Log Level: ERROR

## Description

The toll-free phone number cannot be verified because Twilio returned an unknown error during the verification review. Messaging traffic on this Toll-Free phone number is blocked.

### Possible causes

* Twilio could not determine a specific rejection reason for the toll-free verification request.

### Possible solutions

* Contact Twilio Customer Support to investigate the rejection and determine the next step.
* Review Toll-Free best practices before you submit a new verification request.

#### Additional resources

* [Toll-Free Verification Console Onboarding Guide](/docs/messaging/compliance/toll-free/console-onboarding)
* [Buying a toll free number with Twilio](https://help.twilio.com/articles/223183168-Buying-a-toll-free-number-with-Twilio)