You must always keep in mind not only the small size of screens where your application will be displayed but also how much they will vary. Do not assume your user's device will have the same size as the one you're using. Some devices may have a landscape orientated display others will have a portrait one, …
Common Hard Keys * Power Key […] * Lock/Unlock Key […] * Increase/Decrease Key […] Optional Hard Keys * Capture Key […] * Keyboard […]