Sorry for late reply. Hope you've got sorted. If not, I have D600 with Samsung Studio. Connected and set up fine for me with supplied USB to mobile cable and I straightforwardly transfer MP3s from PC to phone (set one as ringtone) and pics both ways. The trick s getting the basic set up done. Try uninstalling the software from your PC and reinstalling. Make sure you install WITHOUT mobile connected and only connect when wizard tells you to.