“AT&T, which put up a website for system updates, did not say how many customers were affected by Thursday’s outage.”
Downdetector logged about 58,000 reports around noon ET as phones across the US dropped to SOS. The San Francisco Fire Department warned AT&T customers could not call 911. AT&T’s explanation was “an incorrect process used as we were expanding our network, not a cyber attack.” AT&T found time to rule out hackers but not to count the customers it cut off from 911.