destination_unroutable

Remove the number from future sends. Do not retry.

{
  "object": "event",
  "type": "message.failed",
  "livemode": true,
  "data": {
    "object": "message",
    "message_id": "msg_uuid",
    "status": "failed",
    "delivery_error_code": "destination_unroutable",
    "error_message": "The destination cannot be routed or is not provisioned for SMS."
  }
}