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AT&T likes the free money they can make by stealing your available data towards the end of the cycle so you have to pay more for extra data that doesn't carry over even though you purchased it three days before the end of the cycle. It's interesting how the available data declines towards the end of the cycle even when the phone is in storage with the battery pulled. It's a secondary phone that doesn't get used all the time. It's really interesting how it can use 600 mb of data while not being used. Support can't explain it either, but it happens almost every month.