My phone is doing the same exact thing. No volume bar, only sound from speaker phone and phone related sounds. Apps and music don't play. My headphone jack was packed full of lint from being in my pocket day after day. I cleaned it out with a paper clip and started working just fine. But after awhile it cut out again. I plugged the headphones in and out several times in a row, started working again. So I assume that when I plugged the headphones in while the jack was packed with lint it must have made a connection come loose. I am close to my upgrade so I am not going to pay the money to have it fixed.