# SMS DLR Error Codes

| SMS DLR Code    | Status Description                                                    |
| --------------- | --------------------------------------------------------------------- |
| UNDELIV err:0dc | Absent Subscriber                                                     |
| EXPIRED err:206 | Absent Subscriber                                                     |
| EXPIRED err:21b | Absent Subscriber                                                     |
| UNDELIV err:21b | Absent Subscriber                                                     |
| EXPIRED err:023 | Absent Subscriber                                                     |
| EXPIRED err:027 | Absent Subscriber                                                     |
| EXPIRED err:053 | Absent Subscriber                                                     |
| EXPIRED err:054 | Absent Subscriber                                                     |
| UNDELIV err:058 | Absent Subscriber                                                     |
| UNDELIV err:439 | Absent subscriber or ported subscriber or subscriber is barred        |
| UNDELIV err:254 | Subscriber's phone inbox is full                                      |
| EXPIRED err:254 | Subscriber's phone inbox is full                                      |
| EXPIRED err:220 | Subscriber's phone inbox is full                                      |
| EXPIRED err:120 | Subscriber's phone inbox is full                                      |
| REJECTD err:008 | Subscriber's phone inbox is full                                      |
| UNDELIV err:255 | Invalid or inactive mobile number or subscriber's phone inbox is full |
| UNDELIV err:20b | Invalid or inactive mobile number                                     |
| UNDELIV err:004 | Invalid or inactive mobile number                                     |
| UNDELIV err:510 | Invalid or inactive mobile number                                     |
| EXPIRED err:215 | Invalid or inactive mobile number                                     |
| EXPIRED err:20d | Subscriber is barred on the network                                   |
| UNDELIV err:130 | Subscriber is barred on the network                                   |
| UNDELIV err:131 | Subscriber is barred on the network                                   |
| EXPIRED err:222 | Network operator system failure                                       |
| EXPIRED err:602 | Network operator system failure                                       |
| EXPIRED err:306 | Network operator system failure                                       |
| UNDELIV err:032 | Network operator system failure or operator not supported             |
| UNDELIV err:008 | Subscriber is on DND                                                  |
| UNDELIV err:085 | Subscriber is on DND                                                  |
| UNDELIV err:065 | Message content or SenderID is restricted                             |
| UNDELIV err:600 | Message content or SenderID is restricted                             |
| EXPIRED err:40a | SenderID not whitelisted on the account                               |
| UNDELIV err:082 | Network operator not supported                                        |
| UNDELIV err:00a | SenderID is restricted by the operator                                |
| EXPIRED err:078 | Restricted message content or SenderID is blocked.                    |
| UNDELIV err:432 | Restricted message content or SenderID is blocked.                    |
| EXPIRED err:088 | Restricted message content or SenderID is blocked.                    |
| UNDELIV err:198 | Restricted message content or SenderID is blocked.                    |


---

# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.hollatags.com/sms/sms-dlr-error-codes.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.