The wall-phone! Cause it hangs on the wall and you have to paste a notebook up next to it. I know that you're trivially younger than me - but maybe enough that you didn't have a corded phone as a teenager? As a kid we had rotary, my grandma did for ever - just call the operator.

I guess I don't know anyone personally that has a home telephone as their main number now. That's pretty weird huh.