This is also how the tabloids "hacked" peoples mobile phones. Many mobile telco voicemail systems are setup to recognize an incoming call to the VM system from

This is also how the tabloids "hacked" peoples mobile phones. Many mobile telco voicemail systems are setup to recognize an incoming call to the VM system from a mobile # as being the owner of that mailbox. I'm surprised this worked so well for the OP and you didn't just end up in everyones VM box.