Bluejacking is the practice of sending messages between mobile users using a Bluetooth wireless connection. People using Bluetooth-enabled mobile phones and PDAs can send messages, including pictures, to any other user within a 10-meter or so range. Because such communications don't involve the carrier, they are free of charge, which may contribute to their appeal.
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Bluetooth was created to enable wireless communications between various devices; the user can set a device to be inaccessible, accessible to a specific device (through a process known as pairing), or discoverable, that is, accessible to all devices in range. Although Bluejacking is, in and of itself, a legitimate activity, it has enabled a number of less innocent practices, including Bluesnarfing attacks, which involves theft of data from a mobile device, and reportedly a fad known as toothing, the practice of sending an invitation to nearby mobile device users for the purpose of setting up a quick sexual liaison.