Apple iPhone 4 - a beautiful piece of hardware with state of the art engineering - thinner than the iPhone 3G, faster processor, and an upgraded display. Another major difference in its architecture is the beautiful glass finishing on the back of the iPhone 4. Apple have made claims that the its new iPhone 4 screen is “chemically strengthened to be 20 times stiffer and 30 times harder than plastic” and it’s “ultradurable and more scratch resistant than ever.”