LOL! I just used caller id. If a call comes in "unidentified" I don't answer. If I go crazy and answer anyway and it's a tele, I hang up on them. That used to bother me. My mom always taught me to be polite to people. Luckily, I've out grown it!

I used to pretend one of the cats was about to step on the phone and disconnect it: "Chester! NO! DON'T STEP ON THAT ...
then hang up.