iPhone Accounts for 55% of US Mobile Web Traffic

AdMob, recently acquired by Google, has released its latest report breaking down the US Mobile Web Traffic by OS. The winner, the iPhone, which accounts for 55% (including both the iPhone and iPod Touch).
HTC is up, mainly because of its Android devices. RIM/Blackberry is also up, but very little. Nokia and Palm took the biggest drops.
Source: AdMob PDF via The iPhone Blog
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Wow, that’s impressive. No wonder AT&T is having so many problems…
Problem is, we aren’t told how these numbers are being generated.
What sites are being monitored, and how are they determining what OS is requesting it?
The thing with iPhone, RIM, and Android is that their browsers are very easily identified. How many WM users actually USE pocket IE? Are they looking at the browser ID tag? With a plethora of WM browsers such as Opera, Netfront, and various server-side compression browsers such as SkyFire and Opera Mini, most of which identify themselves as Desktop-based browsers, how is AdMob identifying these?
I’ve had this conversation with another statistics firm before, and the numbers are not necessarily accurate given all the information…
I’m still rather certain that iPhone is the dominating browser in the US, however I think Windows Mobile and “other” are not getting counted properly.
This may be reporting false data.
Most WinMo users I work with have the user agent strings for there browsers set to none mobile parameters. This way they get the none-mobile version of sites that redirect based on user-agent string from the browser.
Find it real hard to believe that webOS is ahead of WinMo in the surfing relm.
The report doesn’t seem to be accurate.