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Helpful answers
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Jan 19, 2014 5:21 PM in response to Billy132by ckuan,She should plug in to the wall power charger over the night.
Wi-Fi is switched OFF when iPhone sleeps, so all updates use cellular data.
Read here
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Jan 19, 2014 5:22 PM in response to Billy132by FoxFifth,You can check Settings > Cellular > Use cellular data for: to see which apps are using cellular data and how much they have used since you last reset the statistics. It also gives details of system services which use cellular data.