Enable data over mobile network


I have disabled internet over mobile network, but for two days data meter is showing ~1MB downloaded over the night. When I go to statistic it says that media downloads take the most part, then browser, gallery, market. How can this be when I disabled data over mobile network and wireless is disabled always? When I had wireless turned on, this didn't happened. I have Motorola Defy plus, 2.3.4. Backgroud data is turned on, but I don't know if this can be the problem.