| Error Code | Error Description |
| 1001 | Invalid COM port setting |
| 1002 | Invalid baudrate setting |
| 1003 | Invalid parity setting |
| 1004 | Invalid data bits setting |
| 1005 | Invalid stopbits setting |
| 1006 | Cannot open COM port |
| 1007 | Cannot close COM port |
| 1008 | Invalid timeout setting |
| 1009 | Cannot change port setting when connected |
| 1010 | Cannot find COM port |
| 1011 | Cannot send command to modem |
| 1012 | Cannot read modem response |
| 1013 | COM port not defined for modem |
| 1014 | Cannot set communication timeout values |
| 1015 | Connection verification failed |
| 1016 | User defined modem initialization failed |
| 1017 | Default modem initialization failed |
| 1018 | Error response to user defined modem initialization string |
| 1019 | Error response to disable modem echo |
| 1020 | Disabling network registration unsolicited result code failed |
| 1021 | Setting of ME to full functionality mode failed |
| 1022 | Error response to enable long result code format |
| 1023 | Error response to enable numeric result code format |
| 1024 | No response to full functionality mode command |
| 1025 | No response to disable new message indication command |
| 1026 | Disabling new message indication failed |
| 1027 | No response to disable modem echo command |
| 1028 | Error disabling modem echo |
| 1029 | No response to enable long result code format command |
| 1030 | Error enabling long result code format |
| 1031 | No response to enable numeric result code format |
| 1032 | Error enabling numeric result code format |
| 1033 | No response to disable network registration unsolicited result code |
| 1034 | Modem not found on the specified serial port |
| 1035 | Modem not found on the specified serial port |
| 1036 | Modem not found on the specified serial port |
| 1037 | Modem not found on the specified serial port |
| 1038 | Modem does not support PDU mode |
| 1039 | No response to minimum functionality mode command |
| 1040 | Setting ME to minimum functionality mode failed |