Mobile data turns itself on again and again; could be caused by WhatsApp My mobile data keeps turning on by itself and uses my data traffic. I think this is because of WhatsApp, but I'm not sure. Is there any other possible reason aside from WhatsApp? How should I stop it from happening?   

Phone: Samsung GT9100i
Android Version: 4.2.1
What other apps related to mobile data are you using? Is there any battery saver app that are using? they can turn your data on or off automatically.
Whatsapp doesn't have the permission to enable mobile data. So it must be some other app. still you can use 3G WatchDog to check if whatsapp is the culprit.