| Error Code | Error Description |
| 6001 | Cannot read message memory type |
| 6002 | Cannot check PDU mode support |
| 6003 | Modem does not support PDU mode |
| 6004 | Cannot connect to modem for deleting message |
| 6005 | Delete message command error |
| 6006 | Cannot set communication timeout values |
| 6007 | Cannot find requested message |
| 6008 | Invalid message item index |
| 6009 | Inbox is already empty |
| 6010 | Unable to delete at least one message |
| 6011 | Delete message error |