The four major wireless carriers in the US had an outage lasting about five hours in several states last night, and a report from Re/code says it was all caused by a hardware problem in AT&T's network.
Although AT&T, Verizon Wireless, T-Mobile US, and Sprint each operate their own cell towers, in the states where the outage occurred they apparently all acquire backhaul from AT&T's network. Re/code reported that "several telecommunications industry sources" confirmed that AT&T's network caused the outage for all four carriers in parts of Tennessee, Alabama, Kentucky and Indiana. (Another report said Georgia was affected as well.)
Since AT&T is the dominant provider in the region, "all the major cellular providers use its networks for backhaul—that is, helping transport the data once it leaves their collection of cellular towers," Re/code wrote.
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