So randomly checking data usage for playing a few hours worth of music here's what happened. I played Pandora for about 2 hours listening to music. Then I decided to listen to Slacker Radio and listened to it for about 45 minutes then I checked the data. This is a brand new phone. Only had it 6 hours. Look at how much data slacker radio used in 45 minutes compared to Pandora. Yes I'm on WiFi. Why does Slacker radio us so much more?