This has bothered me for two years now, but I never really thought about just how wrong it is:
Whenever someone calls me, I don’t answer, and the caller leaves a voicemail, a “2” is displayed in the little red circle over the Phone icon on the Home screen. […] Maybe I’m kind of a simpleton, but doesn’t that kind of make it seem like I’ve missed two calls? Or that I’ve got two voicemails?
He makes some good suggestions for how Apple can fix this.