Today only, CowBoom offers the used Apple iPhone 4 16GB for AT&T Wireless in Black, model no. MC318LL/A, for $249.99 plus $5 for shipping. It features an Apple A4 processor, 326-ppi (pixel per inch) Retina 3.5" display running at 960x640, gyroscope, front- and rear-facing cameras, 5-megapixel camera with LED flash, 720p video capture at 30 fps, 802.11n wireless networking, dual microphones, and more