On Mon, 24 Dec 2012 16:38:08 -0000, "Brian Gaff"
wrote:

Personally I have not ventured down this alley, as I do like to be out of
touch at times just like we all used to be.

That's simple; you just ignore it or switch it off.
I regard most phone calls as intrusions and uninvited, so the caller
can take their chances whether I'm available or not.