Resolved after 1 day 3 hours, affecting MMS Messaging (MM4) and REST APIs - HTTP MMS Messaging, on February 18, 2026.
A subset of outbound MMS messages to AT&T subscribers were intermittently unable to be delivered during the peak messaging traffic hours of 16:00 - 20:00 UTC on February 16, 17 and 18. Bandwidth has concluded its investigation of this issue and details can be found in the following Incident Report: [20260216 | Outbound MMS to AT&T](https://www.bandwidth.com/support/en/articles/14006028-20260216-outbound-mms-to-at-t) 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.
Affected components
Update timeline
- investigating Feb 18, 2026, 06:13 PM UTC
Bandwidth teams are investigating an incident where 10DLC MMS messages towards AT&T destinations are failing to complete as expected.
- monitoring Feb 18, 2026, 09:28 PM UTC
Teams are observing expected messaging behavior. We will monitor for stability.
- monitoring Feb 19, 2026, 05:00 PM UTC
We continue to observe expected MMS Messaging behavior. We will monitor to ensure prolonged stability.
- resolved Feb 19, 2026, 09:26 PM UTC
This incident has been resolved.
- postmortem Mar 09, 2026, 01:13 PM UTC
A subset of outbound MMS messages to AT&T subscribers were intermittently unable to be delivered during the peak messaging traffic hours of 16:00 - 20:00 UTC on February 16, 17 and 18. Bandwidth has concluded its investigation of this issue and details can be found in the following Incident Report: [20260216 | Outbound MMS to AT&T](https://www.bandwidth.com/support/en/articles/14006028-20260216-outbound-mms-to-at-t) 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.
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