Who I have the same questioned this topic

Josh, I can understand your concern regarding data usage, I will look into this further. The category Communications and Data includes music streaming. You can actually see which of your applications are using the most data by going to:

Tap on "Cellular," then scroll down to "Cellular Data Usage." You'll see your data usage (sending and receiving) over the cellular network for each application.

More information on how to monitor your data: http://vz.to/1qGBUwa

RalphT_VZW
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