The problem with POTS these days is that it largely no longer exists at least as it was 50 years ago.
Yes, there is a copper wire coming to your house. That wire connects to your house is dumped onto a fiber trunk at some point(often before it gets to the central office) and it's no longer analog. It no longer has the reliance and fault tolerance that the POTS of the cold war era had.
When the backup generators and batteries of the cell towers go down in a power outage, chances are good that your POTS will go too. In fact, they may shut down the POTS first to allow a longer run time of the cell service.
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