Become a MacRumors Supporter for $50/year with no ads, ability to filter front page stories, and private forums.
Just curious how much it is per minute etc?

It will be pretty high compared to 3g since Pandora auto-detects networks speed and streams accordingly.

You can run a test yourself: just take note of the sent/received numbers, stream Pandora for 30 minutes, calculate the change in sent/received numbers.
 
attachment.php


According to this it's almost identical to 3G.

http://appadvice.com/appnn/2012/10/its-pretty-stupid-ridiculous-how-much-data-netflix-uses-over-lte

You can enable higher quality playback in the settings. That should then use a lot more data.
 
Register on MacRumors! This sidebar will go away, and you'll see fewer ads.