You can do it! VFX has released a new app that enables users to control the camera in 3ds Max via an iPhone.
"iDevCam is an app that allows you to control the camera in 3ds Max 9 and above, thru wi-fi with your iPhone, iPod or iPad.
With iDevCam you can move, rotate or drive cameras in your scene simply by moving and rotating your iDevice. This app will give you an handheld effect and control like seen in some of the latest feature films like Avatar and Rango but without the need for a multi-million dollar equipment."