The following are the different SMS delivery statuses with their descriptions:
| Status | Description |
| NO-CREDITS | Insufficient credits. |
| SERIES-BLOCK | Mobile number series blocked. |
| INV-NUMBER | Invalid number. |
| SERVER-ERR | Server error |
| SPAM | Spam SMS |
| SNDRID-NOT-ALLOTED | Sender ID not allocated. |
| BLACKLIST | Blacklisted number |
| TEMPLATE-NOT-FOUND | Template not mapped. |
| INV-TEMPLATE-MATCH | Template not matching approved text. |
| SENDER-ID-NOT-FOUND | Sender ID not found. |
| DNDNUMB | DND registered number. |
| NOT-OPTIN | Not subscribed for opt-in group. |
| TIME-OUT-PROM | Time out for promotional SMS. |
| DELIVRD | SMS successfully delivered. |
| INVALID-SUB | Number does not exist. / Failed to locate the number in HLR database. |
| ABSENT-SUB | Telecom services not providing service for the particular number. / Mobile Subscriber not reachable. |
| HANDSET-ERR | Problem with Handset or handset failed to get the complete message. / Handset doesn’t support the incoming messages. |
| BARRED | End user has enabled message barring system. / Subscriber only accepts messages from Closed User Group [CUG]. |
| NET-ERR | Subscriber’s operator not supported. / Gateway mobile switching error. |
| MEMEXEC | Handset memory full. |
| FAILED | SMS expired due to roaming limitation. / Failed to process the message at operator level. |
| MOB-OFF | Mobile handset in switched off mode. |
| HANDSET-BUSY | Subscriber is in busy condition. |
| SERIES-BLK | Series blocked by the operator. |
| EXPIRED | SMS expired after multiple re-try. |
| REJECTED | SMS Rejected as the number is blacklisted by operator. |
| OUTPUT-REJ | Unsubscribed from the group. |
| REJECTED-MULTIPART | Validation fail [SMS over 160 characters] |
| UNDELIV | Failed due to network errors. |
| NO-DLR-OPTR | In case operator has not acknowledged on status report of the SMS. |