In addition to the four icons in the bar at the bottom, the Home screen holds 16 application icons. You can create up to eight additional pages for application icons and each page can hold an addition 16 app icons. So a total of nine Home screen pages, each of which can hold up to 16 app icons, plus the 4 icons at the bottom, means that you can have up to 148 apps on your iPhone.
By Rich Hall
Updated 01/25/2010