If you want to control your child and worry about him, I strongly advise you to install an application that tracks the message https://smstrackers.com/blog/how-to-forward-someones-text-to-your-phone/ . I installed this application for my child and now I always know that the child has no secrets from me and I can help him in any situation. I hope that the application will be useful for you and your child will always be safe.