Umm, its a really hard feature to turn off considering how cell phone networks function, you register your phone with nearby towers, basically they can normally triangulate your position to within 10m.
I am not really sure why everyone is so paranoid about others knowing where you are, realistically is it a problem if people know? Technology is advancing at a remarkably fast rate and with networked technology finding people becomes far easier, falling off the grid is the way to become "invisible" however it does mean that you can't really take part in the new networked society (Computer Science geek, I am trackable 24/7/365 and like the security, if something happens finding me is easy, or my stuff).
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