I tend to believe that iPhone sms spy us the best tool each parent should have on his children. Most of the teens communicate through short messages and delete them immediately if they suspect you may have access to their iPhone. This software traces all the messages even the deleted ones. Yes, in their phones these messages are not present but in your account you have details even on the time the messages were send. This becomes important especially when you have warned the children against using their iPhone while in school. With this you will be able to know.