status property
Status is where the message is: "queued", "sent", "delivered" or "failed". "sent" means the carrier took it; "delivered" means the handset got it, and not every carrier or destination reports that.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? status;