But at the same time, violent crimes against people carrying phones without a kill switch surged.
Google and Microsoft will incorporate a kill switch into the next version of their respective operating systems.
Google's Android system runs on more than half of all smartphones used in the United States.
Microsoft's operating system is on all Nokia smartphones.
Today's announcement means that a kill switch will be incorporated into the three dominant smartphone operating systems: Android, IOS, and Windows Phone.
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