How to always adjust to center?

Is one supposed to play a game having the iPhone in vertical position along the earth? Probably not, so, how can I make game adjust its center appropriately :?:

You can choose to have vertical or horizontal orientation, whichever you’d prefer. Check out the verticalOrientation property of the iPhoneSettings class, setting it to true or false can set up vertical or horizontal orientation.

I think unitybuzz is talking about the accelerometer and how to calibrate it.

http://forum.unity3d.com/viewtopic.php?t=15684

aNTeNNa trEE, yes, you pointed to the right place. I am talking about the accelerometer and how to calibrate it.