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iPhone 4 was first unveiled on June 7, 2010, at Apple's Worldwide Developers Conference in San Francisco,[6] and was released on June 24, 2010, in the United States
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It is the sixth generation of the iPhone, succeeding the iPhone 4S and preceding the iPhone 5S and iPhone 5C. Formally unveiled as part of a press event on September 12, 2012, it was released on September 21, 2012
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The device was part of the iPhone series and was unveiled on September 10, 2013, and released on September 20, 2013
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Part of the iPhone series, the device was unveiled on September 10, 2013 at Apple's Cupertino headquarters. It was released on September 20, 2013 along with its mid-range counterpart, the iPhone 5C.
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The iPhone 6 and iPhone 6 Plus are smartphones designed and marketed by Apple Inc. The devices are part of the iPhone series and were announced on September 9, 2014, and released on September 19, 2014
