SlyDial:
Great app when you want to leave someone a voicemail but don't want to call them, you use SlyDial to call the number and it connects you strait to their voicemail, and you can say something like "Hey, I've been trying to call you where are you, alright anyways were heading out" or "Hey, hun we keep missing each other, alright anyways ill try again later". Or you can use it for something less 'Sly' like when your calling a bunch of people to invite them to a party and don't want to make conversation with each person so each call lasts an hour.