| 4720 | destination | invalid--Carrier Rejected as Invalid Destination Address | Carrier Rejected as Invalid Destination Address. This could mean the number is not in the numbering plan (area code does not exist or the number is just invalid) or the number is not enabled for messaging (like a landline). Additionally, for toll free messages to TMobile, this could also mean the user has opted to block all toll free and short code traffic |
| 5650 | destination-failed | Carrier Service Failure | Carrier Service is reporting a failure to send to a destination (mobile operator or handset). |
| 4700 | invalid-service-type | Carrier Rejected as Invalid Service Type | Carrier rejected message for invalid service type. This usually means messaging (SMS or MMS) is not supported by the carrier or handset. |
| 4775 | destination-rejected-due-to-user-opt-out | Carrier Rejected due to user opt out | User has opted out of receiving messages from a particular sender. Remove the destination TN from subscriber list and cease communication with the destination. |
click here for a full list
https://dev.bandwidth.com/docs/messaging/errors/
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