You don’t even have to have that large of a regional disaster affecting hundreds of kilometers. 9/11 took down all telephony in the NYC area due to panicking pe

You don’t even have to have that large of a regional disaster affecting hundreds of kilometers. 9/11 took down all telephony in the NYC area due to panicking people overwhelming things. (9/11 was the worst terrorist disaster in the US, but until the towers started falling only the two towers and a few buildings that caught fire were directly impacted. If you were in, say, Brooklyn, you could see it happening but you were in the safe zone.)