My HTC One V (on 4.0 ICS) seems to be continuously downloading something even when it's inactive, and it's using the battery abnormally fast.
On the first picture, the brown line is for the "Android OS" element, which as you can see is responsible for at least 60% of the data consumption. I don't know what Android is downloading, but it does it continuously and it has a big effect on my battery's life. When I disable mobile data, the battery usage line becomes flat (see second picture). How can I check what exactly "Android OS" is doing? And how can I disable this activity?