You may find that some teens do not want to be traced, and if they are doing something wrong, they may call you from a different number because they will just leave their phone at home. When this happens, and you need to know where they are or who they are with, you can try to use a reverse phone number lookup to see if you can get any information that way reverse cell phone directory. Hopefully this will not be an issue in your home, but it is nice to know you have alternatives.