It�s not a job I�d care to do. I get quite a few calls, mostly from companies I know (my bank and credit cards). This is annoying, because I�m ex-directory but they ask for your number when you set up an account.
I suppose I need a phone which shows you the caller�s number, then I could decide whether to pick it up or not.
I got a call the other day and I knew at once that it was spam ... I just put the phone down straight away without saying a word, which is what I'll do from now on..