Сокет Клиент - Сервер

Здравствуйте. Есть 2 приложения под андроид, клиент и сервер. Клиент отправляет текст при помощи сокетов. Сервер принимает. Локально это работает, от всех устройств в одной сети сообщения доходят. Как отправить сокет на телефон с сервером за приделами сети? Я так понимаю схема следующая.. глобальный адрес - локальный адрес - порт. Но как это реализовать?

Код сервера

public class MainActivity extends Activity {
 TextView info, infoip, msg;
 String message = "";
 ServerSocket serverSocket;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  info = (TextView) findViewById(R.id.info);
  infoip = (TextView) findViewById(R.id.infoip);
  msg = (TextView) findViewById(R.id.msg);
  infoip.setText(getIpAddress());
  Thread socketServerThread = new Thread(new SocketServerThread());
  socketServerThread.start();
 }
 @Override
 protected void onDestroy() {
  super.onDestroy();
  if (serverSocket != null) {
   try {
    serverSocket.close();
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
   }
  }
 }
 private class SocketServerThread extends Thread {
  static final int SocketServerPORT = 8080;
  int count = 0;
  @Override
  public void run() {
   Socket socket = null;
   DataInputStream dataInputStream = null;
   DataOutputStream dataOutputStream = null;
   try {
    serverSocket = new ServerSocket(SocketServerPORT);
    MainActivity.this.runOnUiThread(new Runnable() {
     @Override
     public void run() {
      info.setText("I'm waiting here: "
        + serverSocket.getLocalPort());
     }
    });
    while (true) {
     socket = serverSocket.accept();
     dataInputStream = new DataInputStream(
       socket.getInputStream());
     dataOutputStream = new DataOutputStream(
       socket.getOutputStream());
     String messageFromClient = "";
     //If no message sent from client, this code will block the program
     messageFromClient = dataInputStream.readUTF();
     count++;
     message += "#" + count + " from " + socket.getInetAddress()
       + ":" + socket.getPort() + "\n"
       + "Msg from client: " + messageFromClient + "\n";
     MainActivity.this.runOnUiThread(new Runnable() {
      @Override
      public void run() {
       msg.setText(message);
      }
     });
     String msgReply = "Hello from Android, you are #" + count;
     dataOutputStream.writeUTF(msgReply);
    }
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
    final String errMsg = e.toString();
    MainActivity.this.runOnUiThread(new Runnable() {
     @Override
     public void run() {
      msg.setText(errMsg);
     }
    });
   } finally {
    if (socket != null) {
     try {
      socket.close();
     } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }
    }
    if (dataInputStream != null) {
     try {
      dataInputStream.close();
     } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }
    }
    if (dataOutputStream != null) {
     try {
      dataOutputStream.close();
     } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }
    }
   }
  }
 }
 private String getIpAddress() {
  String ip = "";
  try {
   Enumeration<NetworkInterface> enumNetworkInterfaces = NetworkInterface
     .getNetworkInterfaces();
   while (enumNetworkInterfaces.hasMoreElements()) {
    NetworkInterface networkInterface = enumNetworkInterfaces
      .nextElement();
    Enumeration<InetAddress> enumInetAddress = networkInterface
      .getInetAddresses();
    while (enumInetAddress.hasMoreElements()) {
     InetAddress inetAddress = enumInetAddress.nextElement();
     if (inetAddress.isSiteLocalAddress()) {
      ip += "SiteLocalAddress: "
        + inetAddress.getHostAddress() + "\n";
     }
    }
   }
  } catch (SocketException e) {
   // TODO Auto-generated catch block
   e.printStackTrace();
   ip += "Something Wrong! " + e.toString() + "\n";
  }
  return ip;
 }
}

Код клиента

public class MainActivity extends Activity {
 TextView textResponse;
 EditText editTextAddress, editTextPort;
 Button buttonConnect, buttonClear;
 EditText welcomeMsg;
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  editTextAddress = (EditText) findViewById(R.id.address);
  editTextPort = (EditText) findViewById(R.id.port);
  buttonConnect = (Button) findViewById(R.id.connect);
  buttonClear = (Button) findViewById(R.id.clear);
  textResponse = (TextView) findViewById(R.id.response);
  welcomeMsg = (EditText)findViewById(R.id.welcomemsg);
  buttonConnect.setOnClickListener(buttonConnectOnClickListener);
  buttonClear.setOnClickListener(new OnClickListener() {
   @Override
   public void onClick(View v) {
    textResponse.setText("");
   }
  });
 }
 OnClickListener buttonConnectOnClickListener = new OnClickListener() {
  @Override
  public void onClick(View arg0) {
   String tMsg = welcomeMsg.getText().toString();
   if(tMsg.equals("")){
    tMsg = null;
    Toast.makeText(MainActivity.this, "No Welcome Msg sent", Toast.LENGTH_SHORT).show();
   }
   MyClientTask myClientTask = new MyClientTask(editTextAddress
     .getText().toString(), Integer.parseInt(editTextPort
     .getText().toString()),
     tMsg);
   myClientTask.execute();
  }
 };
 public class MyClientTask extends AsyncTask<Void, Void, Void> {
  String dstAddress;
  int dstPort;
  String response = "";
  String msgToServer;
  MyClientTask(String addr, int port, String msgTo) {
   dstAddress = addr;
   dstPort = port;
   msgToServer = msgTo;
  }
  @Override
  protected Void doInBackground(Void... arg0) {
   Socket socket = null;
   DataOutputStream dataOutputStream = null;
   DataInputStream dataInputStream = null;
   try {
    socket = new Socket(dstAddress, dstPort);
    dataOutputStream = new DataOutputStream(
      socket.getOutputStream());
    dataInputStream = new DataInputStream(socket.getInputStream());
    if(msgToServer != null){
     dataOutputStream.writeUTF(msgToServer);
    }
    response = dataInputStream.readUTF();
   } catch (UnknownHostException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
    response = "UnknownHostException: " + e.toString();
   } catch (IOException e) {
    // TODO Auto-generated catch block
    e.printStackTrace();
    response = "IOException: " + e.toString();
   } finally {
    if (socket != null) {
     try {
      socket.close();
     } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }
    }
    if (dataOutputStream != null) {
     try {
      dataOutputStream.close();
     } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }
    }
    if (dataInputStream != null) {
     try {
      dataInputStream.close();
     } catch (IOException e) {
      // TODO Auto-generated catch block
      e.printStackTrace();
     }
    }
   }
   return null;
  }
  @Override
  protected void onPostExecute(Void result) {
   textResponse.setText(response);
   super.onPostExecute(result);
  }
 }
}