AT&T Explains What Caused Outage Yesterday

AT&T has issued a statement on what caused a major outage of its wireless network yesterday morning, lasting up to 11 hours for some customers. "Based on our initial review, we believe that today’s outage was caused by the application and execution of an incorrect process used as we were expanding our network, not a cyber attack." The outage started around 4am ET. By the middle of the day, AT&T said that 3/4 of its network had been restored, with full recovery by mid-afternoon. The FCC has launched an investigation into the incident. During the outage, most customers were still able to call 911 via other networks, (as indicated by an "SOS" icon in the status bar), as required by the FCC. However the outage did affect FirstNet, the AT&T-operated network dedicated to public safety.