I am trying to use iTunes U to listen to lectures. I downloaded the lectures I want but when I'm in a poor reception area (such as underground on the subway), the app will not play any of my downloaded lectures. If I am in a good reception area, the app will load the lecture and keep playing it through poor reception areas. What am I missing? Also, if I leave iTunes U open in the background, my phone loses about 30% more battery during my eight hour workday. I wish this app worked better on my phone. In theory, it's useful.