Movement by tilting phone

Hello, atm i have more or less made a game, but i rather have it as a game on a phone instead of computer. for now the movement is left/right arrow keys and A/D. As this is the first game i have made in Unity, i kinda lack the skills to know everything, so i was hoping for some guidance, on how to make the script. Thanks for any help at all & merry christmas x). the script i have atm

 using UnityEngine;
 using System.Collections;

 public class playerMovement : MonoBehaviour
 {
 private Rigidbody2D myRigidbody;


 public GameObject player;
 public float movementSpeed;
 public float fallSpeed;

 // Use this for initialization
 void Start()
 {
     myRigidbody = GetComponent<Rigidbody2D>();

 }

 // Update is called 50 times per second
 void FixedUpdate()
 {

     player = GameObject.FindGameObjectWithTag("player");
     player.GetComponent<Rigidbody2D>().freezeRotation = true;

     float horizontal = Input.GetAxis("Horizontal");

     HandleMovement(horizontal);

     myRigidbody.gravityScale = myRigidbody.gravityScale * fallSpeed;

 }

 private void HandleMovement(float horizontal)
 {
     
         myRigidbody.velocity = new Vector2(horizontal * movementSpeed, myRigidbody.velocity.y);
     

     //myRigidbody.AddForce(new Vector2(0, jumpForce));



 }

 }