bluejacking
(ˈbluːˌdʒækɪŋ) n (Communications & Information) the practice of using one Bluetooth-enabled mobile phone to gain access to another, esp in order to send anonymous text messages
[C21: from Blue(tooth) + (high)jacking]
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014