I have 500MB on my plan. Never I managed to use it all and one day the usage showed 489MB though I did not use data this day.

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I have 500MB on my plan. Never I managed to use it all and one day the usage showed 489MB  though I did not use data this day. How could this have happened?
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Nina Krakovna

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Posted 1 year ago

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Allan, Mobile Master

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Could you take a screenshot of where it says this? Did you have data turned on at all that day or did someone have access to your phone and may have turned it on for a minute?
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Bernard, Official Rep

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You can check what was using data on your iPhone Nina. Or what sites you have been visiting. Another thing to check is wi-fi assist and make sure it's turned off. 

http://www.macworld.com/article/3018525/iphone-ipad/how-to-avoid-a-surprising-bill-due-to-wi-fi-assi...
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Robert, Mobile Master

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Also check what app sed so much data like that : http://www.wikihow.com/Check-Data-Usage-on-an-iPhone