iphone 6s plus using mobile data while on wifi

My daughter who has iphone 6s plus stayed at home for several days, never going out, stayed on wifi all time while talking to friends on her phone. Yet managed to use up mobile data. Other daughter same kind of phone used no data even though she ventured out. How do I stop the phone from using data while on wifi?

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  • Hey Tobias, 

    Check the feature called WiFi Assist. When enabled, it uses a mobile data plan to supplement a slow or otherwise saturated WiFi data connection.

    You should also probably set up some caps and alerts to notify you or disable data services if they go above normal, expected levels.

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  • thanks, I think the wifi assist is for new phones? could not find that on my 6s plus. I did turn off everything in background apps, maybe that will help? Thanks for the tip to cap data.

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  • Turning off mobile data definitely will help. The WiFi Assist setting was introduced in iOS 9, so it should be there at the very end of that long list in Settings > Cellular. You can even search for it by name in the Settings app by scrolling up, above your name and profile photo.

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