If you're using iOS 9 and your data rates are reaching new highs, watch out for an otherwise-useful feature called "Wi-Fi Assist." It automatically allows your phone to download data via your cellular plan when Wi-Fi coverage isn't great, ZDNet explains, which is fine—but can lead to high bills if, say, your office Wi-Fi is poor.
You can turn it off at Settings > Cellular (called Mobile Data in certain areas) by scrolling to the bottom of the page for the toggle.
Some users have already found surprises there:
- I usually use 1-2GB of mobile data a month, this month I’m up to 7. I suspect iOS 9 wifi assist, anybody else?— Jim Ray (@jimray) September 24, 2015
- Pretty certain ios9's "wifi assist" is responsible for my last huge 4g data bill. http://t.co/NNFRkX7kgn— Dan Walsh (@travors) September 24, 2015
See how crazy sales are for the new iPhone 6S and 6S Plus.
This article originally appeared on Newser: Why iOS 9 Users Are Getting High Bills
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