Gyro Y axis problem help Y axis/angle is wrong

Hello everyone i need help in gyro..
Firstly im using mobile device Portrait mode..
1
Debug.Log(gyro.attitude.y);

This code gives me Y axis/angle but its wrong.
When i turn my phone to up down or left right Y is changing..
It must be only change Y when i turn my phone left right..
Why up down is affect Y angle ?

 

Code (CSharp):

1. using System;
2. using UnityEngine;
3.  
4. public class Gyro : MonoBehaviour
5. {
6.     public float moveSpeed = 80f;
7.  
8.     private Rigidbody rb;
9.  
10.     // Use this for initialization
11.     void Start()
12.     {
13.         rb = gameObject.GetComponent<Rigidbody>();
14.     }
15.  
16.     public void Update()
17.     {
18.         Vector3 movement = new Vector3(Input.acceleration.x, 0f, Input.acceleration.y);
19.         rb.AddForce(movement * moveSpeed);
20.     }
21. }

This is what I use for Gyro. It works, not perfect but it works (Landscape mode). You may be able to use this for portrait?

 

Sorry but its not gyro ... its acceleration
This is the gyro link ; https://docs.unity3d.com/ScriptReference/Gyroscope.html
Thanks for reply btw