There is so much going on with Android in the background. If you want no data at all, just turn off mobile networks in settings. It will be hard to trim it down to use no data and retain functionality (IMO). Data usage is a fact of life with Android (and most every smartphone now I would imagine). edit - Also, task killers often do more harm than good on Android. http://geekfor.me/faq/you-shouldnt-b...-with-android/