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SMS and MMS 10DLC Failure

Incident Report for Bandwidth

Postmortem

Between 20:20 UTC on October 7, 2026 and 20:40 UTC on October 8, 2026, outbound 10DLC SMS and MMS messages towards AT&T destinations incorrectly failed to deliver due to an off-network condition labeling the messages as fraud.

Bandwidth is continuing to investigate this issue to identify all actions necessary to prevent this from recurring and will update this post with an Incident Report after investigations have concluded.

We are grateful you have entrusted Bandwidth as your communication partner and we are sorry if this issue resulted in any disruption to your services.

Posted Oct 08, 2026 - 05:36 EDT

Resolved

This incident has been resolved.

Posted Oct 07, 2026 - 23:05 EDT

Monitoring

Teams are observing expected messaging behavior and will monitor for stability.

Posted Oct 07, 2026 - 22:18 EDT

Investigating

Bandwidth teams are investigating an incident impacting outbound 10DLC messages towards AT&T. These messages may incorrectly fail to deliver due to an off network condition labeling said messages as fraud.

Posted Oct 07, 2026 - 17:51 EDT

This incident affected: United States Messaging Services (SMS Messaging (SMPP), MMS Messaging (MM4)).