I'm receiving such an incredible number of bogus calls at the moment (phone is ringing something like 10 times a day), that I'm very unlikely to answer the phone at all. In fact, I'm [again] inclined to stop having a phone at all, or to only run an answering machine with no recording capability and just an announcement to send emails.
I really, really hate phone calls. They're like interrupts, always put you out of the context you were working on. I much rather prefer asynchronous communication such as email, letters and fax. I can poll them when I think it is appropriate.