If it weren't for the verification image which prevents automated sending, this site would be perfect to interface IVM with (using a plugin). Again here is another site, but it also requires human verification. Essentially you need to find some sort of online service that allows you to send text messages to cell phones in Brazil, and then program a plug-in to interface and send text messages through that site.
Another method is to purchase a GSM interface module for a computer that allows sending of text messages, then program a plug-in for IVM to interface with the module's program/driver.