I just got an iPhone 5s. My wireless plan is with AT&T and includes unlimited cellular data. When I open the Music app and go to iTunes Radio, a dialog appears stating:
Use Cellular Data?
Additional fees may apply when using cellular data for iTunes Radio, iTunes Match, and Automatic Downloads.
Is AT&T charging additional fees for using these services, or is this dialog only warning about the high rate of data usage that may cause limited-data subscribers to exceed their monthly data allowances?