I just bought a 1Gb data add-on for my pre-paid plan ($15 text/picture messaging base plan). It says I've used 6.5 Mb already, but my new iphone (6, iOS8) says I've only used 1.3 Mb in my cellular data usage history. All background refreshing has been turned off for any apps that have that feature. I did send two pictures, but picture messaging is supposed to be included in the plan. Would that cause the discrepancy? I just refreshed my Koodo self serve webpage and the data usage has gone up, even though I'm on wifi and shouldn't be using data. Is data used when I make phone calls? That should just be minutes, right? I'm new at smrtphoning.