If I have a supported WinMo device on an AT&T network, do I still have to pay this additional fee?
Yes, this is the choice made by AT&T for these devices. These devices have the same service characteristics as described above, including direct billing by AT&T, no advertising, and access to Pandora One features on your computer. If you are unable to download Pandora by visiting www.Pandora.com on your WinMo mobile browser, then your device is not supported.