Is he using a headset? I have two teenagers in the house, they both use iPhones with a group call of some kind. iPhones on speaker so we occasionally get to hear from all of their mates as well. They get a bit shouty and carried away but nothing too bad, when it does get silly I usually wander in uninvited, say hello to their mates, and start asking about girlfriends etc. Things usually quieten down after that 🙂
