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PercentMobile is free, but the high-level data in the reports become public. (They can be made private by request). The service is built on top of TigTags, an enterprise mobile analytics platform that starts at $1,000 a month. PercentMobile is basically a lead generator for that service.
To get a sense of some of the data you would see, check out this report for FourSquare, the mobile social network that MG is in love with. Not surprisingly, 76.5 percent of all of its traffic is mobile. Although it comes as an iPhone app, you can also access it via a mobile browser. The most popular device accessing it that way is not the iPhone (since most people use the app), but rather the Blackberry (9.9%), followed by HTC’s G1 Android phone (9.6%), followed by two more Blackberry models (8.9% and 7.4%), and then the iPhone (7.3%), and then another Blackberry (7.1%). Guess which platform FourSquare is going to develop an app for next? Yup, the Blackberry.
Every Website should know how much of its traffic comes from mobile, and from what devices and geographies.