Hypothetical Tracking Software
Say a few friends and I all had BB Curves. Say we wanted to be able to see where the other was via some non-GPS program like google maps does. Also say once you install this software on the phone and agree to let it track you, it turns on with the phone automatically and can't be shut off unless the phone is shut off. Also, there is no evidence the app is installed on your phone unless you go into application loader to put it on/take it off or something that other people wouldn't know it was on our phones.
Does such a thing exist?