Mac Forums

I have an Iphone 4s that is new and I only have 2gb of data so I'm pretty limited. So whenever I browse and such I always make sure that I am on wifi. However when I go to check my usage of celluar data is says that I've recieved and sent like 1mg, but I don't know how I've sent or recieved that data if Im always on wifi whenever I browse. So is there a way to turn off data completly so that I don't go over my limited amoutn of data? Becasue apparently I'm using some data when really I'm always using wifi so I don't know why that is.