The iPhone 5 featured a taller, 4-inch display and Apple’s newly introduced Lightning connector. The iPhone 3G added 3G network support, and was followed by the iPhone 3GS with improved hardware, the iPhone 4 with a metal chassis, higher display resolution and front-facing camera, and the iPhone 4S with improved hardware and the voice assistant Siri. The first-generation iPhone was a GSM phone and established design precedents, such as a button placement that has persisted throughout all releases and a screen size maintained for the next four iterations. Apple has released twelve generations of iPhone models, each accompanied by one of the twelve major releases of the iOS operating system.
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