ATTN T-Mobile users.
So on 6/18/2014 T-Mobile announced free music streaming all of their simple choice plan customers.. means this, if you have T-Mobile and are on any of their simple choice plans, Music Streaming through Pandora, iHeartRadio, iTunes Radio, Rhapsody, Spotify, Slacker, and Milk Music do not count towards your monthly data.
I called them, and spoke to two tiers of customer service. If you are streaming Pandora through the Uconnect "Via Mobile" It DOES count towards your data. you can however use the pandora app on the phone and play it through the Bluetooth and that will not count towards your data.
Just an FYI
Yes I have a Jeep.