I don't have a personal mobile either. They seem so expensive (at least the modern ones do) that I am often staggered when I see people who I know earn a lot less than I do owning something that I would consider very expensive. But then I'm not a very phone-y person either.

I do have a work phone (a Blackberry Curve) that I am allowed to make personal calls on if I exclude them from my expense claim. After deducting calls home when I am working away (which I'm allowed to claim), my monthly personal calls cost is hardly ever more than £1 and often £nil.