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ATT’s botched network update caused yesterday’s major wireless outage
(arstechnica.com)
This is a most excellent place for technology news and articles.
They framed it incorrectly but they're still right, mistakes happen, and no matter what you plan for really bad things can happen.
This wasn't a catastrophe it was some downtown (and it wasn't even all their customers in all their service areas -- my uncle had this problem his wife did not, they're both on AT&T in literally the same house). It's happened with Google, it's happened with Amazon AWS, it's happened with various other major players. Nobody and no department is immune to them, making AT&T a nationalized company is very unlikely to have helped here.
In fact, because we're so bad at raising taxes to fund our federal agencies and things ... it might actually be worse in terms of reliability.