Send SMS?

How I can send messages SMS to a cellular telephone from my application?
Exists some FREE Web service?

(In Code Project there is an example, but it does not support my country, Argentina)

Thanks!

there are no free SMS gateways unfortunatly, not to my experience.

you need to sign up to an SMS gateway, they then will send you api's to use from within your application

you could also use a gsm-modem...