On my iPhone 5 nano-SIM tray, on the inner edge (stand the SIM tray on its edge, with the longer outside edge away from you), there are these white bands? Are these some kinds of serial markings? Unlike the older iPhones, the trays no longer have the IMEI number etched on them. What are these markings? Does your iPhone 5 nano-SIM tray have these markings too?