Trying to save and load from a text file on android.

This what I have written so far and it works fine in the editor but when I try it on my android phone it doesnt work. So what am I doing wrong?

using UnityEngine; using System.Collections; using System.IO; using System.Text;

public class AndroidScoreSavingTest : MonoBehaviour {

 string message;
 string loadMessage = "Yeah working";
 string data;
 FileInfo f; 
 
 void Start()
 {
     f = new FileInfo(Application.dataPath + "\\" + "myFile.txt");
     Screen.SetResolution(800, 600, true);
 }
 
 void OnGUI()
 {
     GUILayout.BeginArea(new Rect(0,0,500,500));
     GUILayout.Label(message + " " + data);
     if(GUILayout.Button("Save"))
     {
         
         if(!f.Exists)
         {
             message = "Creating File";
             Save();
         }
         else
         {
             message = "Saving";
             Save();
         }
     }
     if(GUILayout.Button("Load"))
     {
         if(f.Exists)
         {
             Load();
         }
         else
         {
             message = "No File found";    
         }
     }
     GUILayout.EndArea();
 }
 
 void Save()
 {
     StreamWriter w;
     if(!f.Exists)
     {
         w = f.CreateText();    
     }
     else
     {
         f.Delete();
         w = f.CreateText();
     }
     w.WriteLine(loadMessage);
     w.Close();
 }
 
 void Load()
 {
     StreamReader r = File.OpenText(Application.dataPath + "\\" + "myFile.txt");
     string info = r.ReadToEnd();
     r.Close();
     data = info;
 }

}