30005: Unknown destination handset

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.

• 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 such as a landline.
• An issue at the mobile carrier is preventing delivery.

• Reproduce the issue by sending another test message using a REST API request to confirm whether the error persists.
• Verify the destination number is in proper E.164 format: [+] [country code] [subscriber number including area code]with the correct country code and subscriber number.
• Check the handset and network conditions on the recipient side such as device power, signal strength, and whether the device is on its home network rather than roaming.
• Test whether the recipient can receive non-Twilio SMS and whether another Twilio number or a shorter one segment message is received.
• If issues persist, gather at least three recent Message SIDs from your Programmable Messaging Logs that show Error 30005 and engage Twilio Support for investigation.

• https://www.twilio.com/docs/messaging/guides/debugging-tools
• https://www.twilio.com/docs/messaging/guides/track-outbound-message-status
• https://www.twilio.com/docs/messaging/api/message-resource
• https://www.twilio.com/docs/glossary/what-e164
• https://www.twilio.com/docs/lookup/v1-api/validation-and-formatting