Wikipedia
Bluejacking is the sending of unsolicited messages over Bluetooth to Bluetooth-enabled devices such as mobile phones, PDAs or laptop computers, sending a vCard which typically contains a message in the name field (ie, for bluedating or bluechat) to another Bluetooth-enabled device via the OBEX protocol Bluetooth has a very limited range, usually around 10 metres (328 ft) on mobile phones, but laptops can reach up to 100 metres (328 ft) with powerful (Class 1) transmitters
Bluejacking - Wikipedia, the free encyclopedia