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- Error 30008 "Message Delivery - Unknown error": The carrier has returned a generic error message.
- Error 30005 "Message Delivery - Unknown destination handset": The carrier has reported the 'To' number is unknown, or no longer in service.
- Error 30003 "Message Delivery - Unreachable destination handset": The carrier has reported the 'To' number is unreachable - the device is likely powered down, out of the service area, or may not accept your messages.
- Error 30007 "Message Delivery - Carrier Violation": The carrier has filtered out your messages for delivery.
- Error 30004 "Message Delivery - Message blocked": Your message has been blocked from reaching the destination.
- Error 30006 "Message Delivery - Landline or unreachable carrier": The destination is a landline phone, or the destination carrier can't be reached.
- Error 30024 Numeric Sender ID Not Provisioned on Carrier: The Numeric Sender ID is not currently provisioned with the carrier.
If you encounter a message failure incident from Twilio that isn't on this list, please visit their website https://www.twilio.com/docs/api/errors#3-anchor to find out more.