I had read about a monthly service ($30.00) that you could track cell phones and see where they have been (GPS route kind of) This was geared more to tracking where your kids are going or have been. I guess businesses could use it too.
I'm not sure if this is available but I feel like it is being tested in Phoenix or I saw it on the Phoenix news
It uses the GPS locator in your phone. You could turn it off if they (big brother ) is tracking you.