| Error Code | Error Description |
| 1001 | Invalid COM port setting |
| 1002 | Cannot find COM port |
| 1003 | Invalid baudrate setting |
| 1004 | Invalid parity setting |
| 1005 | Invalid data bits setting |
| 1006 | Invalid stop bits setting |
| 1007 | Invalid timeout setting |
| 1008 | Cannot open COM port |
| 1009 | Access denied to COM port |
| 1010 | COM port not defined for modem |
| 1011 | COM port is already closed |
| 1012 | Cannot send command to modem (Port not open) |
| 1013 | Cannot send command to modem (Timeout) |
| 1014 | Cannot read modem response |
| 1015 | Connection verification failed |
| 1016 | At least one default modem initialization command failed |
| 1017 | No response to full functionality mode command |
| 1018 | Setting of ME to full functionality mode failed |
| 1019 | No response to disable network registration unsolicited result code |
| 1020 | Disabling network registration unsolicited result code failed |
| 1021 | Error response to user defined modem initialization string |
| 1022 | User defined modem initialization failed |
| 1023 | No response to disable modem echo command |
| 1024 | Error disabling modem echo |
| 1025 | Error response to disable modem echo |
| 1026 | No response to enable long result code format command |
| 1027 | Error enabling long result code format |
| 1028 | Error response to enable long result code format |
| 1029 | No response to enable numeric result code format |
| 1030 | Error enabling numeric result code format |
| 1031 | Error response to enable numeric result code format |
| 1032 | Cannot change flow control when port is open |
| 1033 | No response to ignore DTR toggle setting |
| 1034 | Error ignoring DTR toggle setting |
| 1035 | Error response to ignore DTR toggle setting command |
| 1036 | Modem does not support new call indication with caller ID |
| 1037 | Modem does not support non auto delete type new message indication |
| 1038 | Modem does not support new message indication |
| 1039 | Error disabling new message indication |
| 1040 | Modem does not support delivery report indication command |
| 1041 | Error disabling delivery report indication |
| 1042 | Modem does not support SMS service |
| 1043 | Cannot check PDU mode support |
| 1044 | Modem does not support PDU mode |
| 1045 | Invalid value for read delay timeout |
| 1046 | Modem not found on the specified serial port |
| 1047 | No response to enable automatic network selection command |
| 1048 | Error enabling automatic network selection |
| 1049 | Error response to automatic network selection command |
| 1050 | Specified COM port does not exist |
| 1051 | Error enumerating available serial ports |
| 1052 | No response to minimum functionality mode command |
| 1053 | Setting ME to minimum functionality mode failed |