You don’t actually need a chip for phone tracking, all you need is three cell towers or a van and two towers. further more, the nsa, if they have recording of your voice can tell when ever and wherever you are even if you change phones for every call. It works even better if they have an idea where you are; city or region. Also it would be good to note that your phone has a certain code that it sends to the cell network, it doesn’t even have to be on for the network to receive this code and know your location. Its best to have the battery out of the phone if worried, and put it in a basement. So to sum this up, any phone that’s not an analog phone, with they don’t make any more is susceptible to this, remember those old Nokia Brick phones that came out with the original Snake game on it? those are the last of the analog phones. those are the best to have, I have a few sitting around for when I feel skittish.