The fourth model of Apple's smartphone, which debuted in June 2010. The primary changes are multitasking, much higher resolution (see Retina Display), larger battery, home screen folders, voice control, a thinner case and video calling. A front-facing Webcam and Apple's FaceTime app enable iPhone 4 users and 4th-generation iPod touch users to video call each other over Wi-Fi, not cellular. In addition, a single tap switches the phone from front to back camera to turn the unit into a remote video camera for the person at the other end of the call. See iPhone and Antennagate.
With the flat metal band surrounding the unit, the iPhone 4 has a distinct look from its predecessors. (Image courtesy of Apple Inc.)
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