The big news all over is that iPhones are storing tracking information, basically forever. One question, implied in the interesting Gizmodo article about this is Why Is Apple Tracking You?:
Until Apple stops doing this, or explains why they are doing it, I don’t feel safe.
The answer: because they can. If you are into jailbreaking your iPhone, which is perfectly legal as I understand it, there’s a fix here (but I’ve not tried it).