Increased mobile data usage after installing iOS 9? Trying to fix it.

After updating to iOS 9, your iPhone will automatically switch between Wi-Fi and cellular networks to

provide you with the best possible communication option. The downside is that your iPhone may end up using a lot more cellular data than you expected.

Business Insider reports that someusers see a significant increase in data usage after upgrading to iOS 9. Twitter user Jim Ray points out that he saw an increase in data usage of up to 7GB from 1-2GB after upgrading to iOS 9, and he suspects this is due to the WiFi Assist feature (Help with Wi-Fi).

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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? pic.twitter.com/7T3J0bQf8m

- Jim Ray (@jimray) September 24, 2015

If you notice that your device is using up your mobile data excessively, then the Wi-Fi Assist feature is probably to blame. Here's how you can turn it off.

Fortunately, the process is simple and takes only a couple of steps:

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1. OpenSettingsand presscellular.
2. At the very bottom of the sectioncellulardisable “Wi-Fi Assist”.

That's all! With the Wi-Fi assistant turned off, your iPhone will not automatically switch to a 3G or 4G network. However, you can still use 3G and 4G networks when you are far from a Wi-Fi network.

You can go toSettings> Cellular> Cellular Rate Statisticsto track cellular data usage on your iPhone.