Input.deviceOrientation

public static DeviceOrientation deviceOrientation ;

설명

Device physical orientation as reported by OS. (Read Only)

using UnityEngine;
using System.Collections;

public class ExampleClass : MonoBehaviour {
	AudioSource audio;
	
	void Start() {
		audio = GetComponent<AudioSource>();
	}
	
    void Update() {
        if (Input.deviceOrientation == DeviceOrientation.FaceDown)
            audio.Play();
    }
}