Because with WAN EVDO you can.
I was just spared having to present a weekly review via cellphone and thus turn myself into the person everyone hates on the train — self-important/cellphone man — lord knows there is enough of them in the car with me right now. What no one understands when they are babbling in public is, of course, that the other side of the conversation is opaque to the overhearers. I once took the train from Zurich to Geneva and listened to a guy say “D’accord. D’accord.” (french for OK) about a bazillion times.
So much for using travel time to clean out inboxes or read novels. With wireless it just keeps filling up.