So far, iPad usage (page views) is roughly twice what iPhone usage typically is, but less than what people tend to do on either Windows or Macintosh PCs.
Page views aren't the same thing as "bandwidth consumed," but you can see the pattern: desktop usage is heavier than smartphone patterns.
One suspects today's PC dongle user has a usage pattern more similar to an iPad user than a desktop user. Most of us probably think page view and bandwidth usage will intensify over time on every platform, but that the disparity between PC desktop and "phone" behavior will remain.
There likely are some people who view more web pages on their phones than on their desktops. Generally speaking, though, heavier use occurs on a PC, while smartphone usage is much lower, volume-wise.
