Apple could be testing a technology called Li-Fi, a play-on-words of Wi-Fi, according to code found within iOS 9.1.
Li-Fi was invented by Harald Haas, a researcher at the University of Edinburgh, and has since been worked on by numerous companies.
The technology is about 100 times as fast as Wi-Fi — with speeds of about 224 gigabits per second — because it uses the light spectrum to transmit data.
http://www.businessinsider.com/apple-is-testing-li-fi-on-iphones-2016-1