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Because copper wires could carry enough power to make a landline work when the mains electricity was off due to a power cut

Edit: also domestic routers are buggy and unreliable and need to be restarted regularly

Why is why landlines can easily have a battery. And my cell has one built in

And when the battery is empty, it is empty.

And device companies have gone out of their way to prevent removeable/extra batteries (not talking about power banks).

Having to worry about the CO power, house power, device power, and the power going to towers is a little much for my taste.