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Data Sense is a much touted feature of Windows Phone 8, and a very nice one theoretically, which tracks every byte of data by every single app (including the phone OS itself) over both cellular and WiFi. But most Windows Phone 8 devices on the market these days do not have it on board yet. The reason of its absence, as we've heard, has something to do with lack of carrier support. AT&T is said to be adding Data Sense to its devices in the near future, but other Windows Phone carriers are more or less remaining quiet on the subject.