With its easy-to-use interface, amazing features, and rock-solid stability, iOS — Apple’s mobile operating system — is the foundation of iPhone. And even as other phones try to catch up, the technologies and features built into iOS 4 keep it years ahead of the competition.
Elegant and intuitive interface.
The first time you pick up an iPhone, you know how to use it. That’s because the revolutionary Multi-Touch interface in iOS was designed for the most natural pointing device ever: your finger. So whether you’re using one of the built-in apps or one of the over 350,000 apps and games available from the App Store, you control everything with a tap, drag, swipe, pinch, flick, or twist of your fingers. Even tasks that might seem complicated — such as starting a FaceTime call or editing a video with iMovie — are simple, easy, and fun.Hundreds of amazing features.
The features included with iOS 4 make iPhone powerful, innovative, and a pleasure to use. Here are just a few. Visit the Features page for more
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FaceTime + iOS 4

The world’s largest app platform.
With over 350,000 apps in practically every category, iOS 4 is the platform for the world’s largest collection of mobile apps. Apple gives third-party developers a rich set of tools and APIs, and they’ve been creating apps and games that redefine what a mobile device can do. Where to find these apps? Just browse the App Store from your iPhone and download them with a tap. Learn more about developing for iOSPerformance and stability that lead the industry.
iOS 4 is a desktop-class OS that’s been reinvented for mobile devices. Because it’s based on the world’s most advanced computer operating system — Mac OS X — performance in iOS 4 is fast and stability is rock-solid. iOS 4 manages power efficiently and delivers the best possible battery life. And multitasking — using multiple apps at the same time — in iOS 4 doesn’t slow down the performance of the foreground app or drain the battery unnecessarily.2Hardware and software made for each other.
Because Apple makes both the iPhone hardware and the operating system, everything works together seamlessly and intelligently. This integration enables apps to take full advantage of iPhone hardware features such as the Retina display, the Multi-Touch interface, the accelerometer, the three-axis gyro, GPS, accelerated graphics, and more. FaceTime is a perfect example. It uses both iPhone 4 cameras, the display, one of the two microphones, and your Wi-Fi connection. If you’re on a voice call with someone and want to start a video call, FaceTime switches mics, turns on the front camera, and verifies your Wi-Fi connection — quickly and invisibly.Safe and secure by design.
iOS 4 is highly secure from the moment you turn on your iPhone. All apps run in a safe environment, so a website or app can’t access data from other apps. iOS 4 supports encrypted network communication to protect your sensitive information. Optional parental controls let you manage iTunes purchases, Internet browsing, and access to explicit material. To guard your privacy, apps requesting location information must get your permission first. You can set a passcode lock to prevent unauthorized access to your phone and configure iPhone to delete all your data after too many unsuccessful passcode attempts. And in the event your iPhone is lost or stolen, Find My iPhone allows you to locate it on a map, lock its screen, and remotely delete all your data. If you get it back, you can restore everything from your last backup.Game Center

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