I’m using iOS 13.2 on an iPhone X, and would like to drastically reduce the amount of cellular data my phone is using. In less than a month, my phone has used 10.7 GB of cellular data. 8.5 GB of that is from “System Services,” with 7.9 GB coming from “Documents & Sync.”
Is there any way to see what is using all of that data, or to control what happens over cellular vs waiting for Wi-Fi? My battery also dies quickly, and assume that is related to how much cellular data is being used in background.
What I tried:
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I turned off iCloud Drive syncing over cellular network yesterday morning and then reset cellular data usage statistics. Since then, Documents & Sync has used used 1.0 GB of cellular data .
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I’ve had “Low Data Mode” turned on under Cellular Data Options for the entire month, which doesn’t seem to be helping at all.
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I tried erasing all content and settings and restoring from backup. This may have helped slightly, but it still seems to be using large amounts of cellular data
Best Answer
Take a look at "Wi-Fi Assist", which is found at Settings --> Cellular --> right near the bottom of the list. This setting uses your cellular data when Wi-Fi connectivity is poor.
This may account for cell usage even when you have iCloud Drive turned off.