Will I be charged any fees to use iTunes Radio with my AT&T unlimited data plan? I just got an iPhone 5s. My wireless plan is with AT&amp;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&amp;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?
No you won't be charged anything extra.  The dialog is only warning you about the high data usage.