Cracks appear on the plastic back cover of the Apple iPhone 3G smartphone

Compared with the metal shell of the first generation of Apple iPhones, the second-generation iPhone adopted a plastic back. The official statement from Apple was: "To improve signal quality (metal shells shield radio waves) and avoid fingerprints"; opponents believed that Apple was reducing costs. Now, the saying "you get what you pay for" has come true, as the plastic back cover of the Apple iPhone 3G is now showing cracks. Photos are as follows.