Apple iPhone 4 was released in June 2010 together with iPhone 3GS. IPhone 4 has two versions, 16GB and 32GB. The CEO Steve Jobs revealed the magnanimously designed handset to the world at Apple headquarters’ WWDC. It is no doubt one of the most vibrant and exciting phone ever released.

The main differences between apple iphone 4 and its predecessors include volume controls on the side of the phone along with an accessible microSIM tray, a front-facing camera, 30pin connector for docking, a speaker, a microphone on the back, another microphone at top for noise cancellation, sleep/wake button, and a headset input.

The iPhone 4 also supports what Jobs described as a “retina display” with four times the pixel density of a typical LCD display at a whopping 326 pixels per inch. This is by far the greatest improvement of apple iPhone 4. The Apple i Phone 4G has a unique feature of Face Time video calling which can be possible to iPhone 4G only. The device has a 5 megapixel camera with autofocus and LED flash, featuring Touch focus and geo tagging to make the camera better than any other 5MP camera in any other smart phone.

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