Mobile phones???

Out of all the people I know with mobile phones (lots) I can count on the fingers of one hand those who actually answer the bloody things pretty much every time I phone or text them, and couriously they are probably the busiest ones.
I know people who are pretty certain not to answer.  I know people who don't bother carrying their mobile around.... The clues in the word mobile!
I'm starting to wonder if I'm one of a small minority who have actually figured out that a mobile phone is A  Mobile, and B bloody useless if you don't answer it.