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As long as there are central offices there will be landlines.

Have you looked at the phone cables in your area recently? In the good old days telephone poles in my area carried heavy cables an inch in diameter. Sometimes as many as three of those on a telephone pole.

Each telephone subscriber had a pair of copper wires (a "twisted pair") that went all the way to the central switch.

Now days those have all gone away. We have either 1/2" diameter coaxial cables or buried fiber optics.

You may still have a "landline" into your home but the signal was digitized and traveled most of the distance in digital form. It was converted back to analog near your home. That process depends on local power.

I'd be surprised if you have anything other than a hybrid system. And some do have fiber all the way to the box on the side of their home. Like it or not its a VOIP system.
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