With lots of icons you can express simple quick concepts, you write very simple, instead of "I will go today to cinema, are you coming?"you type icons: "I go today, you come ?" much shorter and faster. If the SMS receiver doesn't have icomessage, no problem, will only get the text translation (English or Spanish), is open to all mobiles.
More info on http://www.icomessage.com
Disclaimer: Icomessage app is SMS tool for user to write SMS on his/her own responsability, therefore icomessage is not responsible for the content being sent and remains solely to the user