Neil Brown on Nostr: AT&T has not disclosed the source of the outage. An "industry source" told CNN that ...

AT&T has not disclosed the source of the outage. An "industry source" told CNN that they suspected the issue related "to how cellular services hand off calls from one network to the next," or peering.

I'm not at all convinced that a phone showing "SOS" on its screen, or an inability to make Wi-Fi calls, is indicative of a network "peering" (interconnection) problem.

https://arstechnica.com/information-technology/2024/02/att-outage-leaves-more-than-70000-phones-without-service/