I recently purchased an iPhone4 along with the $45 a month plan. At the time of purchase I added an extra 500mb of data in case I would run out of data, but after having the phone for over 2 weeks I've only used about 24mb of the 512mb allowed with the $45 a month plan since I mostly use wifi. I added another 500mb on top of the 500mb I added at the time of purchase while messing around trying to remove the first add on. Bottom line is I don't want any data add ons because I don't need them. Will I be charged if I don't use them? Can I remove them?