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When you get an update from the App Store stating a size of, let’s say 179.4 MB, this doesn’t represent the actual amount of data that will be downloaded. In fact, depending of your device, the size will be much smaller. If you want to see this in action, turn on Low Data Mode. Then, go to the App Store and download an application update and look at the actual size of the download in the alert box. Tadam!