Apple Inc. (NASDAQ:AAPL) is going to start building 4.7-inch iPhone screens starting in May, according to Reuters. The new iPhone 6 is expected to arrive this fall. Apple is considering the manufacturing of 5.5-inch iPhones, but the company is reportedly having problems making the screens. The current iPhones on the market are 4-inch and 3.5-inch sizes. The iPhone 4S and previous models are 3.5 inches whereas the iPhone 5 and above is 4 inches.