You might want to turn off this new iOS 9 setting if you don’t have unlimited data

In September, Apple released its latest mobile operating system, iOS 9, which has some great new features like Apple News, better battery life, and split-screen multitasking. But a new feature, called Wi-Fi Assist, may be chomping through your data plans without your knowledge.

The new setting is automatically turned on when a phone is updated to the new OS. It attempts to ensure that users don’t experience any buffering when on a weak WiFi signal. The iPhone will detect when a WiFi signal lacks strength, and switch over to a cellular connection.

iPhone Wi-Fi Assist Screenshot

This feature is great if you are stuck in a place that is near wi-fi, like right outside your home or business or in a coffeehouse with a lot of users on the wi-fi. But there is a cost: The switch to cellular could mean you’re using more data from your monthly plan – with the potential of significantly more than you are used to using.

If you’re on a monthly fixed data wireless plan, it might be worth checking to see if your data consumption has risen. Keep in mind how much data you tend to use on a monthly basis and compare that to your usage since upgrading to iOS 9. Head to Settings > Cellular to see your data tally, and scroll to the bottom to see if Wi-Fi Assist is on.

This new features isn’t a bug. Apple is aware that it is an “issue”. Switching the setting to the off mode should bring your consumption back in line with your normal usage.

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