Here's some more information about this petition(請願書內容):
Apple should replace all broken iphone4s for free due to update of iOS7 which destroys wifi chip.
Apple refuses to investigate and give a clear answer on this in public. They tried to ignore all evidences or analysis which shows it is a problem caused by its software. They blamed this problem to customer's defective hardware without evidence. It is obvious against the law. We need US government's attention!!!!