The major differences between the iPhone 3G and the new iPhone 3G S are some added features in the new iPhone 3G S like faster speed,a new 32GB version,the 7.2Mbps HSDPA,a 3 megapixel camera with tap-to-autofocus,auto white balance,and30fps VGA video recording with editing features.The new iPhone 3G S also features a built-in compass, Nike+ support,and a better battery backup.