usually redundancy. but as these companies squeeze more and more out of gear, we risk large cascade failures that are hard to recover from. could also have been some kind of firmware upgrade. anecdotally, the 4G LTE phones seem to not be affected whereas the newer 5G ones seem to be. maybe it was a botched deployment. i'm sure ATT will give us a really well rounded RCA ;)
pierat|2 years ago
Knowing most megacorps, they'll blame some midlevel engineer doing a "bad" thing, when it was ordered from above.
alephnerd|2 years ago