Security researcher Mordechai Guri with the guidance of Prof. Yuval Elovici from the cyber security labs at Ben-Gurion University in Israel presented at MALCON 2014 a breakthrough method (“AirHopper) for leaking data from an isolated computer to a mobile phone without the presence of a network.

http://cyber.bgu.ac.il/content/how-leak-sensitive-data-isolated-computer-air-gap-near-mobile-phone-airhopper