3. iPhone 3GS
Released in 2009, iPhone 3GS looks identical to iPhone 3G. What was the most obvious difference, was that iPhone GS was significantly faster than the older version (600 MHz up from 412 MHz), and improvements were made regarding the graphic processor. 3.0 megapixel camera — with VGA video recording at 30 FPS represented improvement regarding the captured image quality, since it featured autofocus, white balance control and macro. It also included VoiceOver control and Nike+iPod support.