10DLC MMS Messaging Incident

Update timeline

1. 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.

2. monitoring Feb 18, 2026, 09:28 PM UTC

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

3. monitoring Feb 19, 2026, 05:00 PM UTC

   We continue to observe expected MMS Messaging behavior. We will monitor to ensure prolonged stability.

4. resolved Feb 19, 2026, 09:26 PM UTC

   This incident has been resolved.

5. 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.