TechCrunch reports that AdMob claims that the iPhone makes up 50% of US mobile Web traffic on smartphones. There is just a small problem here, and that is that the data is only based on AdMob's mobile ad network, which favours the iPhone, according to the Business Insider:
AdMob's stats significantly favor the iPhone because of its vast ad inventory in iPhone apps — ads that are not available on other phones — and on iPhone-tailored Web sites, which won't work on some phones
So it looks like AdMob's data is anything but representative of anything but, well, AdMob's own iPhone-favouring ad network. Many of the comments at TechCrunch seem to have caught this small and yet significant detail.
Opera's State of the Mobile Web report obviously only covers Opera Mini users, but gives actual insights into what kind of sites people visit with their phones. It also keeps reports the handsets used to run the application.
Opera Mini can be installed on both feature phones and smartphones.