In telephone What materials have been used and why ?
Some cell phone companies use a mix of iron, titanium, and leftover metal from used cars to make the shell of the phone. To make the keys of the cell phone they use metal they find in the junkyard...somtimes unknown metal and then they melt all into one and put it into a mold. For the paint on the phone they use a mixture of crushed up cockroach, ants, and cow blood and poop. When mixed together this forms a creamy colorful paint batter that keeps it's color for a long time. This is the most efficent way of making cell phones today.