The worldwide mobile phone market grew 11.3% in the fourth quarter of 2009, ending five consecutive quarters of retrenchment. According to IDC's Worldwide Mobile Phone Tracker, vendors shipped 325.3 million units in 4Q09 compared to 292.4 million units in the fourth quarter of 2008.

There were more than 450 million mobile Internet users worldwide in 2009, a number that is expected to more than double by the end of 2013, according to IDC.

IDC's Worldwide Digital Marketplace Model and Forecast finds that most popular online activities of mobile Internet users are similar to those of other Internet users: using search engines, reading news and sports information, downloading music and videos, and sending/receiving email and instant messages.