Please be advised that AT&T has solved this issue and messages are being processed as expected.
End Date/Time: 10/11/2017 01:10 PM ET
Posted about 1 year ago. Oct 11, 2017 - 13:34 EDT
AT&T is experiencing intermittent delays in SMS delivery. AT&T engineers are actively working towards a resolution. SMS (text messages) to AT&T recipients may experience latency in delivery while AT&T works to resolve the issue.
Affected Service(s): SMS Messaging
Expected Impact: SMS (Text Message) Delays for AT&T mobile customers.