I noticed my wife's iphone always shows 3G for about 0.2467 seconds when i turn the screen on and then the wifi icon appears ... googling seems to suggest wifi goes off when sleeping and hence all push notifications must be via 3G?

I guess her data use has never been an issue but if this is true I am with Android for life!

I know you can turn off cellular data at home but I have better things to use my memory brain cells for ...