What I want to know is whether or not you have to have a specific app running on iPhones in order to forward tracking data to the owner like Tile requires. Because Tile's market penetration isn't very big and because you have to have the app on your phone means that there are a crapton of phones out there that aren't helping in the task of locating the device. If Apple is smart, they will build the track-and-forward code into the OS so that everybody with an iPhone will participate in locating the tag even if a given phone owner doesn't have one.