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If you have cellular data service, when you are in a location with WiFi, you can use the iPad Settings to temporarily turn off your cellular data service and use a WiFi connection instead. This will help you to avoid exceeding the maximum allowed data transfer on your monthly cellular plan and save on data service charges. It is recommended to use WiFi whenever it's available (on-campus, in a hotel, or at a conference for example). Reserve the cellular data service for when there is no WiFi available to you.