public class MySamplePushRegistry extends MIDlet
   implements CommandListener, Runnable, MessageListener {
   
   //....
   
   public void startApp() {
      smsPort = getAppProperty("SMS-Port");
      String smsConnection = "sms://:" + smsPort;
      if (smsconn == null) {
         try {
            smsconn = (MessageConnection)
               Connector.open(smsConnection);

            smsconn.setMessageListener(this);
         } catch (IOException ioe) {
            ioe.printStackTrace();
         }
      }
      display.setCurrent(resumeScreen);
   }
   public void notifyIncomingMessage(MessageConnection conn) {
      if (thread == null) {
         thread = new Thread(this);
         thread.start();
      }
   }    
   public void run() {
      try {
         msg = smsconn.receive();
         if (msg != null) {
            if (msg instanceof TextMessage) {

               content.setString(((TextMessage)msg).getPayloadText());
            }
            display.setCurrent(content);
         }
      } catch (IOException e) {
         e.printStackTrace();
      }
   }
   //other methods to follow
}

import org.smslib.*;

public class SendMessageWithPortsSMSLib {
   public static void main(String[] args) {
      CService srv = new CService("COM4", 9600, "", "");
      System.out.println("SendMessage(): sample application.");
      System.out.println("  Using " + srv._name + " v" + srv._version);
      try {
         srv.setSimPin("0000");
         srv.connect();
         srv.setSmscNumber("");
         COutgoingMessage msg = 
            new COutgoingMessage("+9198301...", "Message from smslib API.");
         msg.setMessageEncoding(CMessage.MESSAGE_ENCODING_7BIT);
         msg.setSourcePort(0);
         msg.setDestinationPort(50001);
         srv.sendMessage(msg);
         srv.disconnect();
      }
      catch (Exception e) {
         e.printStackTrace();
      }
      System.exit(0);
   }
}