Apple iPhone 4 8GB Unlocked Cell Phone - Black

The iPhone 4, heralded as the "biggest leap since the original iPhone," uses an all stainless steel body design with an ultra high-density 3.5-inch, IPS, LED-backlit 960x640 326 ppi multi-touch "retina" display, mobile and data antennas integrated in the "metal band" that wraps around the sides of the phone, and a chemically hardened "aluminosilcate" glass front over both the display and a black frame and the chemically hardened black glass back as well (it was introduced with a white option on June 7, 2010, too, but this version did not ship until April 28, 2011).

Regardless of color, both the front and back have an "oleophobic" oil repellent coating.It has dual cameras -- a 5 megapixel HD video/still camera (720p at 30 FPS) with a "backside illuminated sensor," a 5X digital zoom, and an LED flash on the rear and a VGA quality video/still camera on the front designed for video conferencing over a Wi-Fi network with Apple's included "FaceTime" application. It has dual noise-cancelling microphones also.It is powered by an "Apple A4" processor of unspecified speed, has 512 MB of RAM, and has 8 GB, 16 GB, or 32 GB of internal storage (8 GB configuration introduced October 4, 2011).

Network support includes UMTS/HSDPA/HSUPA (850, 900, 1900, 2100 MHz) and GSM/EDGE (850, 900, 1800, 1900 MHz). 802.11g/n and Bluetooth 2.1+EDR are supported as well.Like the iPhone 3GS that came before it, the iPhone 4 includes a digital compass, A-GPS, and an accelerometer, but adds a 3-axis gyroscope to its list of sensors for additional 3D gaming options.Apple reports that the iPhone 4 provides "up to" 40 hours of audio playback, 14 hours of talk time on 2G, 7 hours of talk time on 3G, 6 hours of Internet use on 3G, 10 hours of Internet use on Wi-Fi, 10 hours of video playback and 300 hours of standby time.