DataPilot Sony Ericsson USB Kit for
R300

Back up your cell phone contact information in case you lose, break, or damage your cell phone. Sync your address book contacts with Outlook, Outlook Express, and Palm Desktop software. Add & edit your cell phone contact information from the convenience of your PC.
Transfer your ring tones from PC to your cell phone FREE via data cables. Clip, trim, and edit your MIDI and MP3 files.
Purchase Cables
Sony Ericsson USB Data Cable for R300 (DPA-CU2)
Connect your cell phone to your laptop or PC via a USB port to transfer or backup data, dial up to the Internet or edit ring tones on your phone.
Price: $9.95
Sony Ericsson Universal Connector for R300 (DPA-CV4)
Use our universal cable connectors to connect your USB Computer Connector to the cell phone and transfer cell phone content between your cell phone and computer.
Price: $14.95 
Computer Universal Connector (DPA-CVA)
Use your USB computer connector as a base to connect to all other cell phone manufacturer-specific connectors. Simply plug the corresponding phone connector into your computer connector and start transferring your data!
Price: $19.95 