This is all made possible because Android allows third-party companies to alter the lock screen and other core features, such as the app launcher, which displays app icons and widgets.

WSJ: Facebook Home Review: Facebook Gets a Lock on Phones

In both cases the player can lock-on to nearby enemies, fire two core weapons (a machinegun and the equivalent of a grenade launcher), and unleash a couple of charge attacks that are as explosive as they are damaging.

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Jonathan Broskey, a former Apple employee who now heads the Army's Apple program, argues that the Unix core at the center of the Mac OS operating system makes it easier to lock down a Mac than a Windows platform.

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