- Screen size is 3.5 inches diagonal with resolution of 480x320 at 163ppi (iPhone 3GS and before) and 960x640 at 326ppi (iPhone 4)
- iPhone supports 8 gestures: tap, drag, flick, swipe, double tap, pinch open, pinch close, touch and hold
- When things are moving on screen, the finger can obscure quite a large amount of the display. Interface might need to be designed to ensure that important information is not obscured.
- Simplify gestures are much as possible.
Icons
- Icons should be perceived effortlessly and represent a broader class of similar concepts.
- There are only 10 standard tab icons like bookmarks, contacts, downloads, etc.
- When creating custom icons, use .png files, white with appropriate alpha and no shadow, anti-aliasing, and 30x30 pixel format.
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