UPDATE: AT&T network outage affecting users
UPDATE: AT&T's Twitter account, @ATTCustomerCare, tweets that "We are aware of the issues and are working to resolve it."
A more recent tweet at 11:25am said "Technicians are working towards resolution as quickly as possible."
Reports are coming in that AT&T smartphone users may be experiencing outages for voice and data this morning.
Data, voice and text appear to be affected, with areas near Chattanooga, Knoxville and Nashville among those experiencing issues.
Another large outage appears to be centralized near Louisville, KY.
Like many such outages, it's safe to assume that AT&T is working to solve the problem, but there's no clear time frame for a fix.