iPhone Life - Best Apps, Top Tips, Great Gear

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.

Due to the Apple SDK constraints on developers of iPhone software, data exchanges with your phone is limited to email and local area network connectivity. 

Some iPhone applications such as “Files” allow you to import and read your Word, Excel, and PDF files from your desktop computer to your phone, and move that data to the iPhone by establishing a wireless connection between the phone and desktop over a LAN.