Why is there no uni-body aluminum body for the flagship Android device? According to Lee, it has to do with Samsung being practical. In pumping out the giddlywoowoozillion devices a year that Samsung does, there is no time for the longer process required with some other materials to make sure that there are no defective units being sent out.
LG Optimus G, but did so on the sequel LG Optimus G Pro after listening to its customers. And while the plastic cover feels light and seems to bend to the point of snapping in two, Samsung says its back cover is more durable than the back of other smartphone manufacturers because of the flexibility provided by the plastic which better absorbs physical impact.
The big question is whether Samsung's decision to stick to plastic at a time when HTC went with an aluminum construction with the HTC One, and Nokia offers polycarbonate (along with one rumored aluminum model itself) will have any affect on sales of the Samsung Galaxy S IV.