How do you iChat from iPhone 4 to Mac on WiFi? My Mum in Canada is on a MacBook/Wifi and I'm on my iP4 in Japan. Is her iChat/AOL username supposed to be in my iPhone Address Book first? I added her AOL/iChat email address to my iPhone then tried a Facetime call with that AOL email address but no go. In the iPhone Address Book there is a field for AIM username as well. I added her AIM username but I can't click on the username to start a call. There's no actual iPhone app called iChat is there? It's just a built-in feature of Facetime right?