It only resets that info when you tell it to. So thats your total usage since you have began using it. I still dont see what the fuss is. 2-3gb a month on a iphone is INSANE if you use that much. You have to be some kind of downloading and uploading psycho to pull it off.
I cant speak for the iPad since I dont own one. I still dont see that high of usage with an iPad either.