Re: I wonder
You presume they need to install tracking software or hack it...
Hint, they just wish it turned on. Then they get the key/data from it's own unique id. Everything is "on the cloud", or rather tracked via the ISPs/teleco operators anyhow. Then they known who, if it's your phone, you are. If it's not your phone, they still know where it has been.
Not anon, because it would not make any difference. :P