Downloading apps from the App store can be addicting, especially since there are so many that are free! It’s quite easy to fill up three or four pages of apps in a short period of time. It makes sense to want the apps that we most often use on our main homescreen.
In order to rearrange the apps (which wasn’t available when the first iPhone was released), simply hold down any of the icons, and they will start to jiggle. As long as they are in their “jello” state, you can drag them back and forth to different pages. Organizing you apps from the App Store is a breeze.