Hi to all of you having problems with small amouts of datat being used even though you have turned off mobile data useage! Also to those of you with problems with your device turning on mobile Data and accessing other apps such as Facebook, whatsapp, etc.....WELL Good news GUYS!! I have stumbled upon the soultion. IT TURNS OUT THAT IT'S YOUR GPS LOCATION SERVICE IS THE CULPRIT!!! YES THATS RIGHT GPS LOCATION SERVICES, overrides all data settings, even if you specify use location with Wi-Fi only. As soon as I turned off my GPS location, guess what no more curious data usage when my mobile data is switched off.... Try it guys and let me know how you get on.........