When mobile sales are booming, smartphone thefts are almost certain to rise. That's something San Francisco and New York prosecutors George Gascón and Eric Schneiderman have been telling smartphone makers for over a year, but now they're finally making some headway. After pressuring Apple to implement a "kill switch" inside its devices, the New York Times reports that police officers in London and San Francisco saw iPhone robberies in the cities fall by 24 percent and 38 percent respectively in the six months before and after the company implemented its Activation Lock feature inside iOS 7. Over in New York, robberies were down by 19 percent and those involving grand larcenies dropped 29 percent when the police compared data in the first five months of 2014 with the same period from 2013.