Hi, I'm trying to sort out a battery drain issue (3GS) and it seems to be much, much less of an issue when 'Cellular data' is turned off. When I turn it on, the usage log shows some data being used, but I dont know how? I only have the standard apps installed, an I dont have manual checking for new emails. Notifications are off. I have 4.3.1 and tried deleting my email account and adding it back. Any ideas how to trace the data leak?