I have the free App on three of my family members phones. The app does not show their precise location. It is close enough though, anywhere from 500 to 1000 feet. I have my app set up to know when they arrive/leave home and when they arrive at work and back. No particular reason to know. I use it just because the option is there. This app will not show you where they are if they are talking on the phone. When the phone is in use the app will show that they, say for instance, just left the movie theatre and are five miles from home then it will appear that they are just hanging out in the same place if they are on the phone. Once they hang up the app will relocate them. If this thing has broken up anybody's marriage I'd have to say that particular marriage/romance was ill fated to begin with. I use it for a sense of security. My adult children dont mind that I know where they are and why shouldn't they? The only people that have argued with me against using this app by saying that I am using it to spy on my family turned out to be cheating on their own. Enough said about that. Besides, if you really wanted to catch your mate cheating on you check their cell phone records, not the ones on their phone (too easy to delete), check the ones kept at the Cell Phone service they are using, but youre going to need their password/code. If they dont give you their code, then get suspicious real fast. Unless they are using an extra phone (Wally-World), then you're screwed, but cheaters always screw up at some point. Love is blind my friend, but its not stupid. Trust your gut.