Hell, I barely answer calls from numbers I DO recognize!I use my local data base, my address book. If your name isn't in it, I don't answer the phone.
But for real, I tried a number of Caller ID apps a couple of years ago, and none of them worked. Like, at all. I don't remember which one it was, but they had the gall to explain oh it only works if the caller registers his info with the app and uses it to call you. Well that's kinda pointless isn't it?