Cisco is predicting a 26-fold increase in worldwide mobile data traffic by 2015 due to a projected surge in mobile Internet-enabled devices delivering popular video applications and services. 
The study looks at packets carried over 3G and 4G networks, but not Wi-Fi offloads either in the home or via public hotspots.
Some key findings:
- Cisco predicts that by 2015, more than 5.6 billion personal devices will be connected to mobile networks
- There will also be 1.5 billion machine-to-machine nodes
- Mobile video is forecast to represent 66 percent of all mobile data traffic by 2015, increasing 35-fold from 2010 to 2015.
- Global mobile data traffic increased 159 percent from calendar year 2009 to calendar year 2010 to 237 petabytes per month, or the equivalent of 60 million DVDs.
- Global mobile data traffic grew 4.2 times as fast as global fixed broadband data traffic in 2010.
- Global mobile data traffic in 2010 was three times the size of all global Internet traffic (fixed and mobile) in the year 2000.
- The Middle East and Africa will have the highest regional mobile data traffic growth rates, with a compound annual growth rate of 129 percent (63-fold growth) over the period.
- Latin America anticipates a 111 percent CAGR (42-fold growth), followed by Central and Eastern Europe, with a 102 percent CAGR (34-fold growth), and Asia-Pacific, with a 101 percent CAGR (33-fold growth). Western Europe is forecast to experience a 91 percent CAGR (25-fold growth); North America, an 83 percent CAGR (20-fold growth); and Japan, a 70 percent CAGR (14-fold growth).
http://www.cisco.com