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  • Design: The size is smaller than the previous generation: 34% thinner than the iPhone 3GS. Although it is 3 grams heavier. Hardware: It has an Apple A4 chip inside, just like the iPad. (new big brain) Battery: The battery is 16% bigger than the current one. Coupled with the A4 processor and new display, it results in a longer battery life: Apple claims 40% more talk time. Display: The 3.5-inch multitouch screen has a resolution of 960 × 640 pixels. Apple calls is the Retina Display, and it has four times as many pixels as the current iPhone 3GS' display. Camera: The new iPhone has a bigger sensor for the main camera. It's backlit and has bigger lenses too. Gyroscope: The new iPhone 4 has a gyroscope built-in. This means that it can track movement with a very high precision, much higher than the built-in accelerometers in the previous iPhones
  • The iPhone 4 is an iOS smartphone developed by Apple Inc. Following a number of notable 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 line, which Apple's CEO Steve Jobs touted as the thinnest smartphone in the world at the time; it consisted of an uninsulated stainless steel frame which doubles as an antenna, with internal components situated between chemically strengthened aluminosilicate glass. The iPhone 4 also introduced Apple's new high-resolution "Retina Display"; while maintaining the same physical size and display resolution as its precursors, its liquid crystal display had a pixel density of 326 pixels per inch. The iPhone 4 also introduced Apple's A4 system-on-chip, along with iOS 4—which notably introduced multitasking functionality and Apple's new FaceTime video chat service. The iPhone 4 was also the first iPhone to include a front-facing camera, and the first to be released in a version for CDMA networks, notably ending AT&T's period as the exclusive carrier of iPhone products in the United States. Wikipedia

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