IPhone 4

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The iPhone 4 is a smartphone that was developed and marketed by Apple. It is the fourth generation of the iPhone lineup, succeeding the iPhone 3GS and preceding the iPhone 4s. Following a number of leaks, the iPhone 4 was first unveiled on June 7, 2010, at Apple's Worldwide Developers Conference in San Francisco, and was released on June 24, 2010, in the United States, United Kingdom, France, Germany, and Japan. The iPhone 4 introduced a new hardware design to the iPhone family, which Apple's CEO Steve Jobs touted as the thinnest smartphone in the world at the time; it consisted of a stainless steel frame that doubled as an antenna, with internal components situated between two panels of aluminosilicate glass. The iPhone 4 introduced Apple's new high-resolution "Retina display" (with a pixel density of 326 pixels per inch) while maintaining the same physical size and aspect ratio as its predecessors, Apple's A4 system-on-chip, and with iOS 4—which notably introduced multitasking functionality...

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