it sounds very shady. secret location logs and iphones and ipads tracking you everywhere. everywhere you go. a couple of researchers stumbled upon these files. i want to get more details from christi christina warren. she's a reporter with mashable.com. welcome. first of all, tell us what is it an iphone and ipad that can allow others to track you wherever you go? >> well, there's a file inside the iphone and the ipad that keeps track of all the longitude and latitude coordinates when you're connected to a cell tower. so anytime you're at the market or you're on the road or you're driving, it keeps track of the coordinates where you are based on the cellular towers. and this file is synched back to your computer. >> so if someone knows your phone number, they can track you?