One of the ways that the popularity of online devices is measured is by looking at browser usage and the percent of the ad market that they hold. The iPhone is now sitting on 40% of the mobile ad market according to AdMob.
The iPhone has grabbed 40% of the market in only two years while market share for devices from Nokia and RIM are losing ground. The caveat to these numbers is of course that the figures come from the ads that AdMob itself serves and not the whole market.
Still the numbers are very telling. The iPhone isn’t the only platform growing its market share. Android has grown to 7% of the market and webOS grew from naught to 4%.