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With its ubiquity and simplicity, SMS has become a cash cow for mobile operators, generating the largest slice of their revenues after voice. Research reports and operators’ statistics show that in some countries, SMS generates as much as 40% of an operator’s revenues. Research firm Portio Research forecast that SMS will continue to be the star of data services over the next five years despite declining prices. Global SMS revenues are expected to reach $67 billion by 2012, driven by 3.7 trillion messages, as the service continues to be a phenomenal success as the cheapest, quickest and easiest to use form of peer-to-peer mobile communication.