I recently upgraded from an iPhone 4S to an iPhone 5. On my 4S, when I was listening to music through earbuds, Siri would semi-interrupt the music to announce: "You have a new message from: " and tell me who it was from. I could then decide whether to read it or not. Not sure what the settings were in the 4S, or whether it was just something about iOS5 that doesn't exist in iOS 6...but on my iPhone 5 Siri doesn't do that and I miss that feature. I have to confess the 4S was jailbroke so maybe it was a jailbroke program?