unity3d - 如何控制Unity3d中主摄像头的运动

I am trying to make an mobile application that contains AR(Augumented Reality)-Mode using Unity3D. So I have connected my mobile device with my unity3d program, and the camera works fine. But when move the mobile device, the main camera inside unity program does not move the same orbit that the mobile device moves. Does any one know how to change or control the orbit of the main Camera in unity3d?I am trying to make an mobile application that