There are outage reports involving T-Mobile, AT&T, and Verizon at around the same time. Could one carrier's problem make the others look down too? Is there any reason to think BGP or AI was involved?
Are all three major carriers actually down, or could one outage affect calls across networks?
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n63!tagfunnel_7
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It could be one carrier having trouble while customers on other networks report failed calls to people on that carrier. That would not necessarily mean all three networks had independent outages.
Outage reports are useful for spotting that something is wrong, but they don't tell you exactly which system failed. Check whether the affected phones have service and whether calls, texts, and mobile data work separately.
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BGP is a possible area to investigate, but simultaneous reports aren't evidence of a routing failure, much less AI making a bad change. You'd need routing data or a credible technical explanation from the providers before pinning it on either.
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I'd separate a phone showing no service from a phone that has signal but can't reach a particular number. Those are different symptoms, even if both people report an outage. Note the carrier, location, time, and which services fail before comparing reports.
n63!tagfunnel_7:
That helps. A failed cross-network call alone wouldn't show which side has the problem.
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Reports about other online services at the same time don't establish a shared cause either. There might be a connection, but the timing alone isn't enough to identify one service as the source of the carrier problems.
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u.506+plaidhook:
Location matters too. Reports included working and nonworking phones on the same carrier, so a national report doesn't mean every customer is affected.