It is possible that your teenager stops talking on the phone when you walk in the room because they want to maintain privacy and independence. They may feel that their conversations are personal and do not want them to be overheard by others. Additionally, teenagers are in a stage of development where they are trying to establish their own identity and independence, and they may feel that their conversations are a way to do that. It is important to remember that this is a normal part of adolescent development and not necessarily a sign of anything negative.
