If you received the USB cable with your Sidekick you already know that the only thing you can really do with this cable is watch it sit in the box. There are no connectivity applications available at this time that utilize the USB cable for the Sidekick. No sync functions, no downloadable ringtones, no nothing! Makes you wonder why they even included it with some of the devices ;-/ If you are thinking of getting a cable in the hopes of playing with these types of things on your Sidekick, take my advice, save the six bucks and go buy yourself some lunch. It will be a far better deal and infinitely more satisfying!