The iPhone 4 introduced by Apple is available to pre order in US since yesterday and will be available in other selected countries later in this month. iPhone 4 is available in black or white and in two models. The 16GB model will sell for $199 and the 32GB model will sell for $299 with the usual two year AT&T contract in the US. The iPhone 3GS will continue to be sold with iOS 4 but only 8GB for $99 via AT&T.

Check out the following chart which compares iPhone 3GS and iPhone4.

Do you see anything missing in the chart. They miss out to mention about colors – iPhone 3GS was only available in black while iPhone 4 comes in the both black and white colors.