Using PlayerPrefs on Android

I did a little code on pc
#pragma strict
var nome: String;
function Start () {
nome = PlayerPrefs.GetString ("NomeJogador");
}
function Update () {
}
function OnGUI() {
nome = GUI.TextArea(Rect(100,100,200,100),nome);
PlayerPrefs.SetString ("NomeJogador",nome);

if (nome == PlayerPrefs.GetString ("NomeJogador")!= null)
PlayerPrefs.Save();
{
It's work on pc,but android not let me explain
The user type on textarea,then what is written is saved,in this case is the user's name
When load another scene,what the user typed on the textarea appear in a GUI.Label above
But the problem is on android don't save when we close the application and open again,i want that you write and save,but if exit of the application sttil save what the user wrote
It's like you type your name and still save when you play again.
Thanks in advanced