script Login

tenho este script para login e register, no android funciona, mais no iphone os botões funcionan mais o script não funciona, o que poderia ser?

aqui o script.

using UnityEngine;
using System.Collections;

public class LoginSystem : MonoBehaviour {

 public enum lMode{login,register};
 public lMode LoginMode;

 public GUISkin skin;
 //login
 private string user = "";
 private string pass = "";
 private bool remember;
 private int boolstatus;
 //register
 private string name = "";
 private string password = "";
 private string email = "";

 public string Log;
 public Texture LogTexture;

 public string sceneMap;

 void Start () {
 boolstatus = PlayerPrefs.GetInt("bs");
 if (boolstatus == 1) {
 remember = true;
 }else{
 remember = false;
 }
 if (remember == true) user = PlayerPrefs.GetString ("login");
 }

 void Update () {
 if (remember == true) {
 PlayerPrefs.SetString("login",user);
 boolstatus = 1;
 PlayerPrefs.SetInt("bs",boolstatus);
 }else{
 boolstatus = 0;
 PlayerPrefs.SetInt("bs",boolstatus);
 }
 }
 void OnGUI(){
 GUI.skin = skin;

 GUI.DrawTexture (new Rect (Screen.width / 2 -288, Screen.height / 2 -200, 576, 500), LogTexture);

 GUILayout.BeginArea(new Rect(Screen.width/2 -180,Screen.height/2 +178,380,40),"","");
 GUILayout.Label ("<color=black>"+Log+"</color>");
 GUILayout.EndArea();

 if (LoginMode == lMode.login) {
 GUILayout.BeginArea(new Rect(Screen.width/2 -190,Screen.height/2 -135,380,270),"","Box");
 LoginGUI();
 GUILayout.EndArea();
 }else if (LoginMode == lMode.register){
 GUILayout.BeginArea(new Rect(Screen.width/2 -190,Screen.height/2 -135,380,300),"","Box");
 RegisterGUI();
 GUILayout.EndArea();
 }
 }
 void LoginGUI(){
 GUILayout.BeginHorizontal ("",skin.customStyles[1]);
 GUILayout.Label ("<size=21>Usuário</size>");
 user = GUILayout.TextField (user,15,GUILayout.Width(280),GUILayout.Height(40));
 GUILayout.EndHorizontal ();
 GUILayout.Space (4);
 GUILayout.BeginHorizontal ("",skin.customStyles[1]);
 GUILayout.Label ("Senha");
 pass = GUILayout.PasswordField(pass,"*"[0],20,GUILayout.Width(280),GUILayout.Height(40));
 GUILayout.EndHorizontal ();
 GUILayout.BeginHorizontal ();
 GUILayout.FlexibleSpace ();
 GUILayout.Label ("<size=21>Lembrar Usuário</size>",GUILayout.Width(180));
 remember = GUILayout.Toggle (remember,"", GUILayout.Width (40), GUILayout.Height (40));
 GUILayout.EndHorizontal ();
 GUILayout.FlexibleSpace ();
 if(GUILayout.Button("Logar-se",GUILayout.Height(50))){
 Log = "";
 RequestLogin();
 }
 if(GUILayout.Button("Registrar-se",GUILayout.Height(50))){
 Log = "";
 LoginMode = lMode.register;
 }
 }
 void RegisterGUI(){
 GUILayout.BeginHorizontal ("",skin.customStyles[1]);
 GUILayout.Label ("<size=21>Usuário</size>");
 name = GUILayout.TextField (name,15,GUILayout.Width(280),GUILayout.Height(40));
 GUILayout.EndHorizontal ();
 GUILayout.Space (4);
 GUILayout.BeginHorizontal ("",skin.customStyles[1]);
 GUILayout.Label ("E-Mail");
 email = GUILayout.TextField (email,35,GUILayout.Width(280),GUILayout.Height(40));
 GUILayout.EndHorizontal ();
 GUILayout.Space (4);
 GUILayout.BeginHorizontal ("",skin.customStyles[1]);
 GUILayout.Label ("Senha");
 password = GUILayout.PasswordField(password,"*"[0],20,GUILayout.Width(280),GUILayout.Height(40));
 GUILayout.EndHorizontal ();
 GUILayout.FlexibleSpace ();
 if(GUILayout.Button("Registrar-se",GUILayout.Height(50))){
 Log = "";
 RequestRegister();
 }
 if(GUILayout.Button("Voltar",GUILayout.Height(50))){
 Log = "";
 LoginMode = lMode.login;
 }
 }
 void RequestRegister(){
 if (name.Length < 1) {
 Log = "Preencha o campo do Usuário.";
 }else{
 if(email.Length < 1){
 Log = "Preencha o campo do E-Mail.";
 }else{
 if(password.Length < 1){
 Log = "Preencha o campo da Senha.";
 }else{
 WWWForm register = new WWWForm();
 register.AddField("user",name);
 register.AddField("pass",password);
 register.AddField("email",email);
 WWW w = new WWW("http://nfx.comuv.com/register.php",register);
 StartCoroutine(RequestRegisterInformations(w));
 }
 }
 }
 }
 void RequestLogin(){
 Log = "";
 if (user.Length < 1) {
 Log = "Preencha o campo do usuario";
 }else{
 if(pass.Length < 1){
 Log = "Preencha o campo da senha";
 }else{
 WWWForm login = new WWWForm();
 login.AddField("user",user);
 login.AddField("pass",pass);
 WWW w = new WWW("http://nfx.comuv.com/Login.php",login);
 StartCoroutine(RequestLoginInformations(w));
 }
 }
 }
 IEnumerator RequestLoginInformations(WWW w){
 yield return w;
 if (w.error == null) {
 Log = w.text;
 }
 }
 IEnumerator RequestRegisterInformations(WWW w){
 yield return w;
 if (w.error == null) {
 Log = w.text;
 if(Log == "Conta criada com sucesso!"){
 user = name;
 pass = password;
 name = "";
 password = "";
 LoginMode = lMode.login;
 }
 }
 }
}