Same thing here guys. I usually leave a message as my reason for calling is important enough to justify me picking up a phone moreso than typing an email. Emails I type all day, but phone is not my common form of communication
Of course, if anyone calls MY cell phone, it tells them not to leave a message as I'm usulaly too busy or lazy to get it. If it's important enough, call me back, or send me an SMS so I get the note

For the past 3 years, my friends and collegues do just that now - no more pesky voicemail I need to check in on
