iOS

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iOS, formerly known as iPhone OS (and even Snow Leopard), is the operating system for the iPhone, iPod touch, iPad and Apple TV 2G. iOS has four abstraction layers: the Core OS layer, the Core Services layer, the Media layer, and the Cocoa Touch layer. The OS takes ~350MB of the device's total memory storage, this means that users will not get their full storage space.

In iOS 4.0+, it takes up ~800MB of space, changing the root partition from 500MB to 1000MB, due to the 2x graphics that have been added for the iPhone 4 and iPod touch 4G retina displays.

In iOS 5.0, Apple enable Multitasking gestures by default w/o the need for a jailbreak[1]

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