If it's prone to randomly stopping, you've probably got link-layer problems... sftp, of course, is slower than ftp, but I've used that with good success. As for the special USB cable: one of those is available, but not from Nokia. It wouldn't do away with the need for a power adapter, though, because the power adapter that comes with it is 980mA, and USB is maximum of 500 mA. You'd consign yourself to slow charging, and inability to maintain a charge during heavy usage. <snip>