# 30005: Unknown destination handset

Log Type: CARRIER

Log Level: ERROR

## Description

This delivery error indicates that the destination number is unknown and may no longer exist. Twilio receives this status from carrier partners and returns it to you.

### Possible causes

* The destination number is unknown and may no longer exist.
* The device is powered off or has insufficient signal.
* The destination number cannot receive SMS messages, such as when the number is a landline.
* An issue at the mobile carrier is preventing delivery.

### Possible solutions

* Send another test message with a REST API request to confirm whether the error persists.
* Verify the destination number is in proper E.164 format with the correct country code and subscriber number.
* Check the recipient's device and network conditions, such as power, signal strength, and whether the device is on its home network (not roaming).
* Test whether the recipient can receive non‑Twilio SMS and whether another Twilio number or a shorter one‑segment message is received.
* If the issue persists, collect at least three recent Message SIDs that show error 30005, then open a support ticket with Twilio.

#### Additional resources

* [Debugging Tools](/docs/messaging/guides/debugging-tools)
* [Track the Message Status of Outbound Messages](/docs/messaging/guides/track-outbound-message-status)
* [What is E.164?](/docs/glossary/what-e164)