The iPhone 4 is a smartphone, the fourth generation of the iPhone series by Apple. It follows the iPhone 3GS and precedes the iPhone 4S. Following a number of leaks, the device was unveiled on June 7, 2010, at the Apple Worldwide Developers Conference in San Francisco. It went on sale on June 24, 2010, in the United States, the United Kingdom, France, Germany, and Japan, and then worldwide.

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