To transfer image files from your EOS 10D camera to your computer or smartphone, you will need a USB cable that is compatible with your camera. You can purchase these cables from electronics stores or online retailers. Once you have the cable, connect your camera to your computer or smartphone using it and you should be able to transfer the image files. Alternatively, you could also consider using a memory card reader to transfer the image files from your camera's memory card to your computer or smartphone.