[Outages-discussion] It wasn't just AT&T; every carrier was impacted. Why?

[Chapman, Brad (NBCUniversal)]

Take a look at this scrolling screenshot the reports from Downdetector: every major carrier had some issue, with reports spiking around the same time.

Link: "https://imgur.com/gallery/O3sm3qy"

Someone commented on this post already about a "SIM Card database issue."

Is that a credible explanation?  If so, how and why?

-Brad
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