If you've ever set foot outside the dead centre of a city, you'll know this is completely unviable. I barely ever stray outside Manchester, and even I find places every year with no phone reception despite being highly populated. I'm talking about town centres even.
I know most of us don't have landlines (wasn't even an option when I moved to a new build in 2021). But many older and rural folk do, and they depend on them in emergencies. More fallout of privatising things that should be public. + if you don't like it? Government says complain to your provider.