I’m registered with TPS but that doesn’t actually seem to stop every single annoying call, so whenever the phone rings these days I normally just let the answerphone take it. If it’s a legitimate call from somebody I actually know / want to talk to, they’ll usually start to leave a message and I just pick the phone up then. If they do just hang up, a quick 1471 to make sure it wasn’t anybody I know after all, and that’s it.
Of course, this does mean I miss out on the helpful gentlemen calling from Microsoft to tell me there’s a problem with my computer and they can fix it for me, but I can live with that… 🙂