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Bluetooth was a service associated with wireless technology in the 21st century.
In Pete's World, the Tenth Doctor compared the Cybus EarPods to the "Bluetooth attachments" of his own universe. (TV: Rise of the Cybermen [+]Tom MacRae, adapted from Spare Parts (Marc Platt), Doctor Who series 2 (BBC One, 2006).)
In 2006, Julian Delaware made a revived WOTAN accessible through Bluetooth. (AUDIO: The Law Machines [+]Matt Fitton, Machines (Torchwood One, Big Finish Productions, 2018).)
Wireless speakers were sometimes known as "Bluetooth speakers". (AUDIO: Doomscroll [+]Ash Darby, Among Us (Among Us, Big Finish Productions, 2023).)
Behind the scenes
In the real world, the name "Bluetooth" is derived from the 10th century Danish and Norwegian king Harald Bluetooth. However, this fact and Harald Bluetooth as a historical figure have not been mentioned in any DWU media.