According to a report from Research and Markets, revenues from voice calls still make up 80 percent of worldwide total mobile revenues, but of the non-voice service revenues, SMS accounts for between 75 percent and 80 percent of that ARPU. The report also predicted that by 2012 the worldwide mobile subscriber base will increase from 2.65 billion to 4.81 billion. The report also claimed that by 2008, Asian markets will account for 50 percent of the worldwide subscriber base.

For more on the report:
- see this press release