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My wife's is in SOS mode here in Michigan. She can't even make calls over Wifi with the wifi calling feature enabled.

I'm on AT&T which is fortunately up and working - but it sucks so bad at a baseline level that it might as well be having an outage too lol.

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We also had issues in Michigan with Verizon, but they seem to be corrected now.

Im from Michigan and its not corrected in Michigan yet.

1. How many people have a VoIP solution on their phones to use over WiFi in a case like this?

2. What is the percentage of homes with twisted pair landlines down to these days?

afaik most carriers in the US offer a form of voip over wifi. it needs to be enabled for your phone.

This is called "Wi-Fi Calling" and it also seems to be down for those affected. (n =~ 150 phones I'm tracking)

On my phone in Seattle Verizon Wi-Fi calling doesn't work but FaceTime audio does.

Yep.

Wi-Fi Calling is a mix of GRE/IPSec tunnels to carrier servers (which were still functioning during the outage) that then hook into cellular infra on the backend (which wasn't working). On my firewall, I was seeing phones make that GRE tunnel connection, but it was just a gaping void after that.

FaceTime does not use cellular infra at all (except as a potential IP network interface)

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