Apple is replacing iPhone screws -- but it may be the consumers who are really getting screwed. In line with its infamous philosophy of maintaining absolute control over its products, sources said U.S. Apple stores are replacing screws on iPhone 4s brought for servicing with tamper-proof screws to prevent anyone else from opening the device. Kyle Wiens, chief executive of iFixit, a prominent Apple repair and parts supplier, said the purpose of the new screws is to keep people out of the iPhone and prevent them from replacing the battery. He said he noticed in November that screws were being...