Free web service to send sms

Does anybody knows about free webservices to send sms?
I familiar with servicex.net but the address of the web service dows not much nothing.
any idea can help.
Thank you all.

This might be helpful to you !!!.

Code:

---

using System.Web.Mail:D;
.
.
.
string toPhoneNumber = "DestinationPhoneNumber";
string login = "YoureIPIPIUsername";
string password = "YourPassword";
string compression = "Compression Option goes here - find out more";
string body = "Your Message";

System.Web.Mail.MailMessage mail = new System.Web.Mail.MailMessage();
mail.To = toPhoneNumber + "@sms.ipipi.com";
mail.From = login + "@ipipi.com";
mail.Subject = compression;
mail.Body = body;
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/smtpauthenticate", "1");
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendusername", login);
mail.Fields.Add("http://schemas.microsoft.com/cdo/configuration/sendpassword", password);

System.Web.Mail.SmtpMail.SmtpServer = "ipipi.com";
System.Web.Mail.SmtpMail.Send( mail );

---

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