The article will give you the very basic thing for sending SMS from your computer to any phone over GSM modem.

Using the Code
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#region Private Declaration for the main thread
private Thread m_MailThread = null;
#endregion

#region Constructor
///

/// Constructor for InitializeComponent
///

public MySmsService()//Change MySmsService to your Service Class Name
{
InitializeComponent();
}
#endregion

#region OnStart Event of the service
protected override void OnStart(string[] args)
{
EvtlgSmsService.WriteEntry("MySmsService started!!");
if (m_MailThread == null)
m_MailThread = new Thread(new ThreadStart(SMSThread));
m_MailThread.Start();
}
#endregion

#region OnStop Event of the service
protected override void OnStop()
{
EvtlgSmsService.WriteEntry("MySmsService stopped !!.");
if (serialPort1.IsOpen)
serialPort1.Close();
m_MailThread.Abort();
}
#endregion

#region Sms Main thread
///

/// Sms main thread
///

private void SMSThread()
{
do
{
Thread.Sleep(30000);
SendSMS();
}
while (1 == 1);
}
#endregion

#region Send Sms function
///

/// SendSMS for sending the SMS
///

private void SendSMS()
{
SendSMS("+91000000000", "Hello This is a test message");
//+91 is the country code and followed by phone number
}
#endregion

#region Function for sending the Sms
///

/// Overloaded send SMS for sending the SMS
///

///
///

private void SendSMS(String phoneNumber, String message)
{
try
{
if (!serialPort1.IsOpen)
serialPort1.Open();
serialPort1.Write("AT+CMGF=1" + (Char)13);
serialPort1.Write(String.Format("AT+CMGS=\"{0}\"" + (Char)13, phoneNumber));
serialPort1.Write(String.Format("{0}" + (Char)26 + (Char)13, message));
EvtlgSmsService.WriteEntry("SMS sent successfully");
}
catch (Exception e)
{
EvtlgSmsService.WriteEntry("SMS sending failed:" + e.Message);
}
}
#endregion
}