Additional Apps that Don’t Have an Icon
In addition to the 22 applications that are shown on the iPhone Home Screen, there are a few more applications that are not shown. First, there is the home screen itself. This is called Springboard by Apple.
There is also the lock screen which is shown when the iPhone is turned on and requires the user to "slide to unlock". This application could be part of springboard but I am going to place it in a separate directory called lockscreen. The main reason for placing the lock screen in a different directory is to separate different types of code from each other to simplify development and updates.
A newer application that is only available on the iPhone 3GS is Voice Control. This app is started by holding down the home button for a few seconds, then when the screen appears, you can say a command. If Voice Control recognizes the command, it will start the appropriate application. This application will be placed in the directory voicecontrol.
There also needs to be a directory for other parts of the iPhone OS that aren't true applications. The main two types are the Status Bar and the Pop-up. The status bar is located at the top of every application and the popup could be located over any application that is open. These will also be placed in separate directories to separate their code.
Those are the major applications that will need to be separate. If there are any additions needed, I will update this post accordingly.