NO Gyro on iPhone 4S

I'm running the following code with Unity 3.5.5 on an iPhone 4S iOS 5.1.1.

"NO Gyro" keep being printed on the iPhone 4S, am I doing something wrong?

 private var gyroBool : boolean;
 private var accelBool : boolean;
 
 function Start () {
 	// make landscape view
 	Screen.orientation = ScreenOrientation.LandscapeLeft;
 	//Setup controls
     gyroBool = SystemInfo.supportsGyroscope;
     accelBool = SystemInfo.supportsAccelerometer;
 }
 
 function OnGUI () {
 	if(gyroBool){
 		GUI.Label (Rect (10, 70, 200, 20), "Has Gyro");	
 	}
 	else {
 		GUI.Label (Rect (10, 70, 200, 20), "NO Gyro");	
 	}
 }