Apple aleady has this feature on its iPhones and it has been credited with reducing the instances of phone theft. Giving authenticated users/phone owners the ability to disable a phone that’s been lost or stolen could certainly prevent a lot of grief, although some of the more cynical among us might wonder if this, like so many other technologies, will end up being used – by hackers or even by the government – to shut down phones without the owners’ permission.
Read more about this here:
http://threatpost.com/google-microsoft-to-implement-mobile-kill-switch/106778