<div dir="ltr"><div>Another plausible explanation beyond Andy's suggestion of users having trouble calling AT&T numbers and blaming their own carrier would be users who are out of their primary carrier's coverage area and are unknowingly roaming on to AT&T's infrastructure. That would fit with how it seems like reports of issues with other carriers are more sporadic than those on AT&T or their MVNOs.</div><div><br></div><div>That's just a guess from an outsider though, I have no idea how common roaming is these days or whose customers can roam where.</div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Thu, Feb 22, 2024 at 12:03 PM Chapman, Brad (NBCUniversal) via Outages-discussion <<a href="mailto:outages-discussion@outages.org">outages-discussion@outages.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">I'm sorry, Andy. I must have emailed the outages-condescension listserv in error. My apologies.<br>
<br>
Does anyone else have an insight about why the outage affected every one? Was AT&T's infrastructure really the source of the disruption as Andy says? If so, does this highlight a potential problem of a private company having too much control over a critical piece of public infrastructure?<br>
<br>
...or did the equipment upgrade at the 33 Thomas Street NSA listening outpost not go as planned? :-D <br>
<br>
—Sent from my iPhone<br>
<br>
> On Feb 22, 2024, at 8:53 AM, Andy Ringsmuth via Outages-discussion <<a href="mailto:outages-discussion@outages.org" target="_blank">outages-discussion@outages.org</a>> wrote:<br>
> <br>
> <br>
> <br>
>> On Feb 22, 2024, at 10:41 AM, Chapman, Brad (NBCUniversal) via Outages-discussion <<a href="mailto:outages-discussion@outages.org" target="_blank">outages-discussion@outages.org</a>> wrote:<br>
>> <br>
>> Take a look at this scrolling screenshot the reports from Downdetector: every major carrier had some issue, with reports spiking around the same time. <br>
>> <br>
>> Link: "<a href="https://urldefense.com/v3/__https://imgur.com/gallery/O3sm3qy__;!!PIZeeW5wscynRQ!rv688OpWswUnLFdugjEzHYHhrlS2Omb0viPzs_V1eR15-dTlj2DMBGFbdnd9ZCzHvQWXZ5eTLtMUv_BAOi6YvfTmRfRxltw$" rel="noreferrer" target="_blank">https://urldefense.com/v3/__https://imgur.com/gallery/O3sm3qy__;!!PIZeeW5wscynRQ!rv688OpWswUnLFdugjEzHYHhrlS2Omb0viPzs_V1eR15-dTlj2DMBGFbdnd9ZCzHvQWXZ5eTLtMUv_BAOi6YvfTmRfRxltw$</a> "<br>
>> <br>
>> Someone commented on this post already about a "SIM Card database issue."<br>
>> <br>
>> Is that a credible explanation? If so, how and why?<br>
>> <br>
>> -Brad<br>
> <br>
> DownDetector is mostly garbage. It consists of 100% user-submitted reports.<br>
> <br>
> But the tech illiterate media has no clue, so they take it as gospel and run with it.<br>
> <br>
> If you are a T-Mobile customer and calling your girlfriend or boss or whomever and they are an AT&T customer, and it doesn’t go through, who do you blame? T-Mobile of course. Even though they were not at fault.<br>
> <br>
> Also, how many of those MVNOs actually use AT&T’s infrastructure? Quite a few.<br>
> <br>
> That’s what is going on with the other reports on DownDetector.<br>
> <br>
> Again, repeat after me: DownDetector is not an official source. DownDetector is not an official source. DownDetector is not an official source.<br>
> <br>
> <br>
> -Andy<br>
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