I'm a techno dummy and don't understand much in this realm, lol, but with my new att sim plan nexus 7 mobile, I appear to have used 4gb of my monthly 5gb in less than one week. I've streamed two movies, downloaded apps and music and a couple books and magazines. I've surfed web and done gmail. I have no auto syncs turned on, no gps turned on and i use airplane mode when I'm done with internet and email. WiFi not an option. Is that data usage for real or is there something I need to know about setting up and using this device? TIA for any input!