---
page_type: error
code: 30005
message: "30005: Unknown destination handset"
level: ERROR
product: Programmable SMS
---

## Description

This delivery error indicates that the destination number is unknown and may no longer exist. Twilio surfaces this status based on delivery information from carrier partners.

### Possible Causes

- The destination number you are trying to reach is unknown and may no longer exist.
- The device you are trying to reach is not on or does not have sufficient signal.
- The device cannot receive SMS (for example, the phone number belongs to a landline)
- There is an issue with the mobile carrier

### Possible Solutions

Reproduce the issue by sending another test message using a REST API request, or by using the [Send an SMS "Try it out" flow](/docs/messaging/guides/guide-to-using-the-twilio-virtual-phone#test-sms-messaging-from-the-twilio-console) in the Twilio Console (Virtual Phone).

Verify the destination number is formatted in [E.164](/docs/glossary/what-e164) format: `[+] [country code] [subscriber number including area code]` and that you are targeting the correct country code and subscriber number.

If you see similar results, continue troubleshooting with the following checklist:

- Is the destination device powered on?
- Does the device have sufficient signal? If not power the device off, wait 30 seconds, and then power it back up.
- Is the device connected to the home carrier's network? We cannot guarantee message delivery on devices roaming off-network.
- Can the device receive non-Twilio SMS?
- Can the device receive messages from another Twilio number (non-Alphanumeric Sender ID), or with a shorter one-segment (non-concatenated) body?
- Can other devices using the same mobile carrier receive your messages?

#### Continued issues with Error 30005

Twilio's Support team can help investigate what went wrong with delivering your message. Please collect 3 or more message SIDs in your [SMS logs](https://www.twilio.com/console/sms/logs) from the last 24 hours that were flagged with `Error 30005`, and [open a support request](https://www.twilio.com/console/support/tickets/create).