MIDlet - using socket and databases

I'm starting to learn MIDlet and I need a little help with a project. I have a MIDlet which would be a client. This client has to connect to a database - it will send some information to it and also receive an answer back. I have to use Socket for the connection. My problem is that the Server won't see the Client connected even though I use the same port.
So here is the code for the server:

public class Server {
      
	public static void main(String[] args) {
		
		try{
                    while(true){
			ServerSocket ss=new ServerSocket(5000);
			System.out.println("Server started...");
			Socket s=ss.accept();

			s.getReceiveBufferSize();
			System.out.println("Client connected");
			BufferedReader in=new BufferedReader(new InputStreamReader(s.getInputStream()));
			String mesaj="";
			while(!mesaj.equals("end")){
				mesaj=in.readLine();
				System.out.println(mesaj);
			}
                }
		}catch(Exception e){e.printStackTrace();}
	}

}

The Client:

public class Client extends MIDlet implements CommandListener,Runnable{
    private boolean isPaused;
    private static Display display;
    private Form f;
    private StringItem si;
    private TextField tf1;
    private TextField tf2;
    private boolean stop;
    private Command sendCommand = new Command("Send", Command.ITEM, 0);
    private Command exitCommand = new Command("Exit", Command.EXIT, 0);
    InputStream is;
    OutputStream os;
    SocketConnection sc;

    private Client client;
    //Sender sender;

    public Client(){
        display = Display.getDisplay(this);
        f = new Form("Socket Client");
        si = new StringItem("Comanda:", " ");
        tf1 = new TextField("Nr zbor:", "", 30, TextField.ANY);
        tf2 = new TextField("Nr bilete:","",30,TextField.ANY);
        f.append(si);
        f.append(tf1);
        f.append(tf2);
        f.addCommand(exitCommand);
        f.addCommand(sendCommand);
        f.setCommandListener(this);
        display.setCurrent(f);
    }

    public void start() {
        Thread t = new Thread(this);
        t.start();
    }

    public void run() {
        try {
            sc = (SocketConnection)Connector.open("socket://localhost:5000");
            si.setText("Connected to server");
            is = sc.openInputStream();
            os = sc.openOutputStream();

I didn't put the rest of the code cause it's long and the connection is the only problem I have. I need the server to recognize the client. Don't tell me to use Http or what else there is cause it's school assignment and I have to use sockets.

Thanks in advance!