| Error code | Description
| Explanation |
| 153 | Absent Subscriber | Subscriber handset not connected to the network. Likely turned off or outside the area of coverage. |
| 150 | Unknown Subscriber | The MSISDN is not active with the carrier |
| 300 | Invalid Destination Address | The MSISDN does not exist |
| 310 | Invalid Source Address | The source address is not permitted. Refer to Country Information and local regulations |
| 151 | Call Barred | Message rejected due to active barring by the end-user. |
| 61 | Destination blocked | Account not permitted to reach the destination MSISDN |
| 62 | Keyword blocked | A phrase or word in the body of the message has been caught in the anti-spam filter |
| 255 | Error, personal service barring, MT Personal Determined Barring Black List | The end-user has opted out from receiving messages. Either all A2P messages or sender ID specific |
| 212 | Equipment not short message equipped | The number cannot receive text messages, for example Data-SIMs |
| 158 | Memory capacity exceeded | The handset does not have sufficient free memory to accept the SMS |
