Here's something you might not know that can make the iPhone easier to use. When you are setting an appointment time in the calendar, or dealing with any of the iphone selection rollers (like a safari pop-up list) you can flick and roll, or you can tap. Tap 1 one line above or below the current selection and the roller will roll 1 one line in that direction. Tap 2 lines above or below and the roller will move 2 lines. This makes picking the exact time for an appointment much easier than rolling to it.