I bought a Bluetooth dongle for my G4 to transfer files to and from my Samsung SGH-A412 phone which officially is not supported at all. I tried various third party apps to get my mac to communicate with it to no avail. However, in the Utilities folder I found an app called Bluetooth File Exchange which works if, before trying to transfer files, I first "browse" any bluetooth devices. It usually takes two goes before the connection works and the cell/mobile phone's files appear in the transfer window. I have now transferred ringtones, wallpapers, photos and mp3 files without problems. Make sure you turn on bluetooth on your phone as well as the phones visibility (in the same menu as bluetooth on/off on the Samsung).