If phone manufacturers were to insure that the materials have no "human or environmental cost" attached to them, the price would have to increase significantly (unless I'm missing some key aspects of the manufacturing process). I am not sure consumers are ready to play their part and make up for that price increase. See fair-trade/organic food, which have not yet achieved the kind of scale that would drive the costs down. If you know for a fact that changing the process in a more humane/responsible/sustainable way doesn't have to mean dramatically increased end prices, please do share, it'd be good news for me.