If you want to have greater control over your files, there are many cheap SD card readers available. With some phones and cameras, it is difficult to copy, delete, or move your picture or music files. Large movie files can take a long time to transfer as well. But using an SD card reader will allow you to do these common tasks quickly and easily. Some of the best SD card readers will even let you manage your phone's SIM card. For people living in a digital world, having more control over your devices can vastly improve your user experience.