AT command to send sms.

[newbie14]

Dear All,
Below is my codes. I have already managed to open the port sucessfully. I could send the AT+CMGF command, but in order to read the response as "OK" I had to do 4 is.readLine();. So my next problem is how to send the AT+CMGS which also require to send the ctrl+z command at the end? Below is my codes.

import java.io.*;
import javax.comm.*;
import java.util.*;

public class PortWriter
{
    static Enumeration ports;
    static CommPortIdentifier pID;
    static OutputStream outStream;
    static SerialPort serPort;
    static BufferedReader is;   
    static PrintStream    os;         
    
    public PortWriter() throws Exception{
        try
        {        
        serPort = (SerialPort)pID.open("/dev/ttyUSB0",2000);
        System.out.println();
        System.out.println();
        serPort.setSerialPortParams(9600,SerialPort.DATABITS_8,SerialPort.STOPBITS_1,SerialPort.PARITY_NONE);
  
		try {
		  is = new BufferedReader(new InputStreamReader(serPort.getInputStream()));
		} catch (IOException e) {
		  System.err.println("Can't open input stream: write-only");
		  is = null;
		}

        os = new PrintStream(serPort.getOutputStream(),true, "ISO-8859-1");

        
        }
        catch (PortInUseException e)
        {
        System.out.println("PortInUseException : "+e);
        }
        catch (Exception e)
        {
        System.out.println("PortInUseException : "+e);
        }

    }    
    
    public static void main(String[] args) throws Exception{
        ports = CommPortIdentifier.getPortIdentifiers();
        
        while(ports.hasMoreElements())
        {
            pID = (CommPortIdentifier)ports.nextElement();
            System.out.println("Port " + pID.getName());
            
            if (pID.getPortType() == CommPortIdentifier.PORT_SERIAL)
            {
                if (pID.getName().equals("/dev/ttyUSB0"))
                {
                    PortWriter pWriter = new PortWriter();
                    System.out.println("USB found");
                    try {
                   
                    os.print("AT+CMGF=1");
                    os.print("\r\n");
                    is.readLine();                   
                    is.readLine();
                    is.readLine(); 
                    String cmgfresponse = is.readLine();	
                    System.out.println("CMGF Response is :"+cmgfresponse); 
                    os.print("AT+CMGS=\"[phone]\"");
                    os.print("\r\n");
                    is.readLine();                   
                    is.readLine();
                    is.readLine(); 
                    String cmgsresponse = is.readLine();	
                    System.out.println("CMGS Response is :"+cmgsresponse);
                    if (is != null) 
                    	is.close();
					if (os != null) 
						os.close();
					if (serPort != null) 
						serPort.close();					
					} 
					catch (IOException e) 					
					{					
					System.out.println("could not write to outputstream:");					
					System.out.println(e.toString());					
					}
                }
            }
        }
        
    }
}