Insert the flat end of the spudger between the front panel and the rear case at the lower left edge of the iPhone.

Slide the spudger up the left edge of the phone starting at the lower edge and moving towards the volume control buttons and silent switch, breaking up the adhesive holding the display in place.

Do not try to pry the top edge of the display away from the rear case, as it is held in place by plastic clips that may break.