One of the most frequently requested smartphone security features finally came to the iPhone last year, and it’s already having a major impact. Reuters reports that smartphone thefts are rapidly declining in at least three major cities following the implementation of activation lock on Apple’s devices.

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In New York, iPhone thefts have dropped by 25% over the past 12 months. In San Francisco, they’ve dropped by 40% and in London, thefts have fallen by 50%.

“We have made real progress in tackling the smartphone theft epidemic that was affecting many major cities just two years ago,” said London Mayor Boris Johnson.

Some smartphone makers are still resisting making the kill switch a default feature, instead asking users to turn it on after they’ve activated their phones. Mayor Johnson, San Francisco District Attorney George Gascon and New York state Attorney General Eric Schneiderman believe that the kill switch should be automatic and mandatory.

“The wireless industry continues to roll out sophisticated new features, but preventing their own customers from being the target of a violent crime is the coolest technology they can bring to market,” Gascon said.

The results speak for themselves. As smartphone-related crimes continue to vanish, it’s going to be increasingly difficult for manufacturers and carriers to argue against the kill switch.

Jacob started covering video games and technology in college as a hobby, but it quickly became clear to him that this was what he wanted to do for a living. He currently resides in New York writing for BGR. His previously published work can be found on TechHive, VentureBeat and Game Rant.