London Mayor Boris Johnson has signed on to a smartphone anti-theft initiative recently launched by top law enforcement officials in New York and San Francisco. He is the first official outside of the U.S. to join the effort pushing for major smartphone makers to include technology that would render a smartphone useless if it's lost or stolen.Related StoriesApple adds 17 new artists to iTunes Festival line-up, including Bastille and Tinie TempahHow to book an appointment with Apple
