Haven't had a POTS since 1998 and don't ever intend to have one again. Yes they could be valuable in a large scale / regional situation where cell networks are overwhelmed but to date that has not occurred here. If and when it does, the POTS may not be working anyway...
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Earth and sky, woods and fields, lakes and rivers, the mountain and the sea, are excellent schoolmasters, and teach some of us more than we can ever learn from books.

John Lubbock