Problem sending sms message in winform

See more:

C#

.NET

serial-port

I am trying to develop a WinForm Application that will allow me to send sms message via a serial port. I have bluetooth from samsung gravity tieing into serial port COM7.
The serial port is open Now I only have to find a way to send the message via the open port. The code that i am using which is in the beginning stages looks like this

private SerialPort port;
private string designatedSerialPortNumber;
private string outgoingNumber;
private bool errorOccured;
public Form1()
{
    InitializeComponent();
    port.ErrorReceived += new SerialErrorReceivedEventHandler(port_ErrorReceived);
}
void port_ErrorReceived(object sender, SerialErrorReceivedEventArgs e)
{
    errorOccured = true;
}
private void button1_Click(object sender, EventArgs e)
{
    outgoingNumber = recepientNumber.Text;
    designatedSerialPortNumber = "COM" + PortNumber.Text;
    port = new SerialPort(designatedSerialPortNumber, 9600, Parity.None);
    port.DataBits = 8;
    port.StopBits = StopBits.One;
    port.RtsEnable = true;
    port.DtrEnable = true;
    port.NewLine = System.Environment.NewLine;
    port.Open();
    if (IsOpen() && !errorOccured)
    {
        // port opens and no error was thrown using COM7
        // samsung mobile request permission to serial connect
    }
    port.Close();
}
private bool IsOpen()
{
    return port.IsOpen;
}

If anyone has seen any good examples that they can point me to on sending sms from serial port or if you may be able to give me a few pointers or suggestions it would be greatly appreciated.