If you don't want to be contacted just say you get no mobile signal at home.
My company was taken over around two years ago and the new firm decided support staff didn't need mobile phones, I happily handed my phone back to them and purchased my own on a new contract. About three weeks later I was asked for the number of my new mobile, when I said no they were actually suprised. I'm now enjoying freedom.
[SIZE="1"]Ah... You can't beat the cold steel and the badger. All this electrical rubbish, little wheels spinning around all over the place for callow youths and peach fluff, Not for a man's beard. Razor blades for men! I think we'll have this on number 9. If you're going to have a shave have a close one!
Tony Hancock, The Bedsitter, 1961.[/SIZE]