Unlike Windows, which has been tied to Intel's processor architecture, Google's Android operating system is processor agnostic.

FORBES: Magazine Article

Its enclosure resembles the silver metallic enclosure of a MacBook Pro, but inside, it has the ARM processor architecture and operating system of the iPhone.

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The iPhone 5 features a larger screen, faster networking capabilities, a more powerful processor and an updated operating system, which includes new mapping software that replaces the popular Google Maps.

WSJ: Global Sales of iPhone 5 Kick Off With Crowds