hi all - Let me know if anybody had this problem. Open iTunes store on your iPhone. Select any song and click to play the 30s song preview. On my iPhone 3G the song preview wheel completes the circle but I don't hear sound. I am very sure that my sound level is fine. I have tried this with many song but no sound. Now when I launch my iPod app and play my songs, everything is perfectly fine. Do you people have this issue? Any suggestion?