Customers of numerous U.S. cell service providers were reporting outages early Thursday morning, according to the website Downdetector.com, which tracks such reports. AT&T had by far the most, with more than 30,000 customers telling Downdetector they had no service.
Customers of T Mobile, Verizon, UScellular and Consumer Cellular were also reporting issues.
The reports of outages appear to have started at around the same time, shortly after 3 a.m. EST, Downdetector said, appeared to be waning some three hours later, then picked up again and were nearing 39,000 at 7 a.m. EST.
Some municipalities were experiencing difficulties with 911 service.
The San Francisco sicso Fire Deprtment said  Â
There was no word on the source of the problems.
CBS News has reached out to all the major carriers for comment.
This is a developing story. Please check back for updates.
