My sister has an ipad1 3g wifi. Where she lives tho she has no wifi so it is 3g only. With it set on 3g is it using up her allotted 'time' continually? Does she have to shut it completely off to avoid using up her time. Or does it only use up time if she is on the internet or playing an internet based game. My ipad is always on wifi so I don't understand 3g usage at all. Thanks for any help.