Dear guy in my office

Dear guy in my shared office,
Do you only come into this office when you want to make personal phonecalls on the office phone? That seems to be the case. You speak very loudly and have heated conversations with people that clearly are NOT work related. That is inappropriate and disturbs everyone else in the office. Please, be a bit more considerate. You have a cell phone, use it. Go out into the hallway.

Thanks