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Re:Ask HN: a service that needs SMS by jsgoecke on Monday April 26, 2010 @12:27PM (#1295214)
Give http://tropo.com a try. It also does voice, IM and Twitter along with SMS.
Re:Ask HN: a service that needs SMS by swah on Monday April 26, 2010 @05:24PM (#1296150)
I wish there was some service that would allow me to send SMS for free, and they could add a 30-char ad along...
Re:Ask HN: a service that needs SMS by vlbeta on Thursday April 29, 2010 @01:25PM (#1305213)
http://www.zeepmobile.com/ and http://www.textmarks.com/

Although I'm not sure if they support Brazilian carriers.