For those people who want to know what parts they are:
Top left to right (1) Light sensor and noise reduction circuit, (2) volume button, slient button and power circuit, (3) vibration motor, (4) sim card holder
Bottom left to right (1) screen cover (I don't think it is, it is the screen holder, but screen cover is what it says on the label on the picture), (2) Home button (top is for black bottom is for white), (3) Screen holder (yeah, whoever labelled this picture definitely swap the label for screen cover and screen holder around).