Anyone knows how does it work (data usage) after ported to iPad..I managed to install Whatsapp on my father's ipad mini (wifi only model) last weekend but today my father called me frantically saying that his prepaid was sucked dry in a matter of days almost RM100 in a matter of days..I suspected Whatsapp but I'm not too sure how the charging works..I thought that only activation that requires the phone and then whatsapp on wifi will be free..anyone had any idea? My father is using my old N95 which also have whatsapp installed but not used..