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Verizon is down, with many users seeing 'SOS' – here's everything we know about this outage
(www.techradar.com)
This is a most excellent place for technology news and articles.
I thought this wasn't a legal requirement of US carriers, sharing their towers for emergencies. Maybe it's a state thing.
Google AI search says it’s a federal mandate in the US. I couldn’t find the related legislation though.
I managed to find it.