N90AP

This is the iPhone 4 (GSM model). Announced on WWDC keynote in June 2010. It features a new exterior design, 5-megapixel camera with LED flash, the 960x640 Retina display screen and FaceTime Video Calls. It runs iOS 4.0 and later.

Application Processor
It uses the Apple A4 CPU, same as the iPad, iPod touch 4G, and Apple TV 2G. However, it ships with 512 MB of RAM, double that of the other A4-based devices. 

Baseband Device
It uses the X-Gold 618.

GPS
The iPhone 4 uses Broadcom's BCM4750 single-chip GPS receiver, like the iPad (1st generation). 

Specifications
Color: Black and White

Size: 115.2 mm (4.5 inches) (h), 58.6 mm (2.31 inches) (w), 9.3 mm (0.37 inches) (d)

Weight: 135 g (4.8 oz)

Battery: Standby up to 300 hours, talk time up to 7 hours on 3G and up to 14 hours on 2G

Rear camera: 5MP with Autofocus and manual focus (Tap to focus), supporting HD video recording @ 30FPS

Front camera: VGA photos and video @ 30 FPS, supporting FaceTime Video Calls

Major Upgrades/Difference from iPhone 3GS

 * Retina display with 960x640 pixel at 326ppi
 * New design
 * A4 processor
 * RAM upgrade to 512 MB
 * Gyroscope
 * Totally new baseband device, firmware, and bootloader
 * Two cameras: front (640×480 VGA) and back (5 megapixel)
 * Back camera also has a LED Flash.
 * WiFi support for 802.11n, but 2.4 GHz only