Correspondence between Apple and the U.S. Foreign Trade Zone (FTZ) discovered by 9to5Mac and analyst Matt Margolis reveal that the iPhone maker wants to start operations at its manufacturing plant in Mesa, Arizona, as soon as February. As Tim Cook confirmed, without revealing too many details about it, the Arizona plant will make sapphire glass for Apple, a product that’s believed to be used on a larger scale in future Apple devices – currently sapphire glass covers the Touch ID button of the iPhone 5s and the cameras of the new iPhones. Margolis has recently speculated that there’s plenty of evidence to suggest that next-gen iPhones may have sapphire display glass covers that will include solar panels. While that can’t