The iPhone calendar app has four views: Month, Day, List and a secret view. To find the secret view, put the iPhone calendar in List view.
Next, turn the iPhone sideways. The calendar switches to a Week view!
You can scroll through your appointments by dragging your finger up or down and left or right.
Addendum: Thanks to my life-long friend Dave H. for pointing out that the secret calendar view also works in Day and Month view!