I agree that you have to tell him about this. Start with the phone. That is unprofessional. As far as unbuttoning his shirt, does he unbutton it during your session? Or is that how it is before he comes in? Because if he is doing that DURING your session that is definitely inappropriate and gives me the heebie jeebies. Is he quite older than you? Do you think he is attracted to you? When you say you think he is testing you, what do you mean? Do you think he is looking to make you mad or for a reaction? Just wondering.