| Error Code | Error Description |
| 4001 | Unable to set validity period |
| 4002 | Invalid long message action |
| 4003 | Invalid send delay value |
| 4004 | Invalid send retry value |
| 4005 | Invalid character encoding |
| 4006 | Send message error |
| 4007 | Invalid destination number |
| 4008 | Cannot check PDU mode support |
| 4009 | Modem does not support PDU mode |
| 4010 | Error generating message PDU |
| 4011 | SMSC not specified |
| 4012 | Cannot connect to modem for sending message |
| 4013 | Send message command error (Port not open) |
| 4014 | Send message command error (Timeout) |
| 4015 | Invalid response to send message command |
| 4016 | Submit PDU error (Port not open) |
| 4017 | Submit PDU error (Timeout) |
| 4018 | Invalid response to submit PDU |
| 4019 | Unknown error while sending message |
| 4020 | Insufficient license rights |
| 4021 | System error |
| 4022 | Insufficient license rights |
| 4023 | Cannot check PDU mode support |
| 4024 | Modem does not support PDU mode |
| 4025 | Error generating smart message PDU |
| 4026 | Cannot connect to modem for sending smart message |
| 4027 | Send smart message command error (Port not open) |
| 4028 | Send smart message command error (Timeout) |
| 4029 | Invalid response to smart message command |
| 4030 | Submit smart message PDU error (Port not open) |
| 4031 | Submit smart message PDU error (Timeout) |
| 4032 | Invalid response to submit smart message PDU |
| 4033 | Unknown error while sending smart message |
| 4033 | Unknown error while sending smart message |
| 4034 | System error |
| 4035 | SMSC not specified |
| 4036 | Smart message data length overflow |
| 4037 | Send smart message error |
| 4038 | Invalid destination number |
| 4039 | Invalid smart message source port |
| 4040 | Invalid smart message destination port |
| 4041 | Insufficient license rights |
| 4042 | Insufficient license rights |
| 4043 | Invalid smart message source port |
| 4044 | Invalid smart message destination port |
| 4045 | Invalid destination number |
| 4046 | Smart message send error |