So I had to exchange my thunderbolt due to a faulty head phone jack, get the new phone and the new one does the same thing. Then I tried the models they had displayed in the store same thing. If the headphone plug gets turned clockwise or counterclockwise while in the jack sometimes the sound on the left headphone speaker will go out. Also if the plug male gets pushed gently to the side the left headphone speaker goes out. I tested this with 3 different pairs of head phones. This kind of annoys me I planned on using the thing as my main music player now I have to worry about it being in my pocket and the connector twisting. Pretty lame if you ask me. I figured it was an isolated incident but what are the odds I found 3 different phones that did the same thing. It amazes me the things they cheaped out on making this phone, the volume buttons are junk as well.