I've lost power, Internet and cell service, once all at the same time (http://en.wikipedia.org/wiki/Northeast_Blackout_of_2003).

I've never lost POTS...

And if I dial 911, they know immediately where the call originated, right down to the house, even if I can't tell them.

We use wireless phones through the house, but I keep a POTS plugged in in the master bedroom.