Remove the three large-headed 1.5 mm Phillips screws along the SIM card side of the iPhone.

Keep track of the washers under each of the screws.

Tip: It can be tricky, but it is also possible to just loosen the large-headed 1.5 mm Phillips screws slightly, without having to remove and replace the screw-and-washer set.

Remove the small-headed 1.5 mm Phillips screw near the rear camera (previously removed).