Mobile data surpassed voice on a global basis during December 2009.

This is according to Ericsson measurements from live networks covering all regions of the world, and announced at the CTIA Wireless 2010 convention in Las Vegas.
Ericsson's findings show that data traffic globally grew 280% during each of the last two years, and is forecast to double annually over the next five years. The crossover occurred at approximately 140 000 Terabytes per month in both voice and data traffic.
The data traffic increase is contributing to revenue growth for operators when more and more consumers use data traffic generating devices such as Smartphones and PCs. During the same period, Ericsson measurements show that traffic in 3G networks surpassed that of 2G networks.
"This is a significant milestone with some 400 million mobile broadband subscriptions now generating more data traffic than the voice traffic from the total 4,6-billion mobile  subscriptions around the world," says Hans Vestberg, Ericsson president and CEO. "Our view that the appeal of anywhere, anytime connectivity would drive mobile broadband growth is confirmed by the real world measurements under taken by Ericsson."
Social networking sites on mobile devices and mobile broadband-based PCs now account for a large percentage of mobile data traffic. For example, over 200 mobile operators in 60 countries are deploying and promoting Facebook mobile products, with over 100 million active users accessing Facebook through their mobile devices.
Supporting this view is a recent Ericsson consumer insights study showing that as much as 80% of mobile broadband users demand anytime, anywhere access. It has become part of daily life. The study was based on 4,580 consumers in six mature markets. It also finds that as mobile data traffic increases, the mobile broadband connection is becoming as personal as the mobile phone. 80% of respondents said they would not share their laptop with anyone and 65% would not share their mobile broadband connection.