Right now I’m listening to Pandora on my iPhone 4 connected to a wifi network. At 1:03pm, my sent cellular data was 441KB and my received was 1.1MB. At 1:41, sent was 481KB and received still 1.1MB. Why has my phone sent 40KB of data over the past 40 or so minutes when I’m connected to a wifi network? I know I am connected to wifi correctly because I can turn off 3G on the phone and the music keeps on playing, emails keep on coming, etc. Plus, no additional data is being received through all this. Any ideas what is going on that cellular data is being used while I’m connected to wifi?