Well, I got this phone on Friday. I have it on vibrate while at my desk at work and went to listen to Pandora. I plugged the 3.5mm headphones that I have at my desk and no music. I then tried to listen to the pre-loaded songs, and I heard it play for a bit but then stopped. I noticed that my headphones don't go in all the way so that the whole tip is in the phone. Could this be the reason? Does having the phone on vibrate stop you from hearing music? I really don't think so.