I have tried this with the USB cable and my Mac didn't recognize the phone, then I tried it with Bluetooth and then it said that an MP3 file was invalid. I then attempted to convert the MP3 to a MIDI and then put it on the phone w/ Bluetooth, which worked, however, true MP3 to MIDI conversion is pretty much impossible. If someone knows how to do this, I would also like to know if you can then make those MP3s into ringtones.