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What is Bluetooth? Bluetooth is a cool new way for devices like mobile phones and computers to send and receive information to one another for free! It is a short wireless connection using a low-speed radio frequency to pass the information over. If you have Bluetooth on your phone, it is a good way of swapping ringtones or pictures with your friends for free, or even sending your phone's address book from your SIM card to your computer's hard drive so you have a copy in case you lose your mobile. Cool eh?