View tracks of your conerned people whenever you get time. View tracks of past days and weeks and see where they have been and ensure they lie to you.
Suppose your company provides mobile phones to your employees in the field. How do you know if they are traveling to their assigned destinations? Or image your child tells you they are visiting a friend's house that you approve but instead goes somewhere you told them not to go. With Smartphone Monitoring Software you will know exactly where your employees or children are when they are away.