I'm currently using value plan 50 + suppl 30. Call made mainly between main and supp line - voice, video calls & sms. I would like to know whether i can purchase iPhone 3GS with iData plan 50 added on my current plan? Does it mean i can't share the credit (RM80) between main & supp line if i add iData plan? The video call between main & supp will be free or deducted from iData plan?