@katrinab - Sensible, but missing the point
Why should my choices be restricted by the phone companies being stingy?
I have a perfect signal from O2 at home, due to a mast ~300M away on top of an old factory building. If that gets demolished I'm stuffed, as there are no other high points nearby. At work (on a light industry estate), O2 gives the best signal but it's still rubbish indoors.