Sly Dial - good idea

[Liquid]

It was started by agents who had to call back clients and tell them that they did not get a job, so leaving a message was easier, but has expanded to calling wives and girlfriends, or calling the boss that you could not come in, etc.
I still do not understand how they make it work though. How can they guarantee that you go to someone's voice mail if they are not using their phone.