Upgraded your iPhone to iOS 9? Read this for the sake of your phone bill

Apple CEO Tim Cook introducing the iPhone 6S on September 9, 2015. Apple sold 13 million of its new devices in 9 markets, and plans to open up to 40 more.

iOS 9 added some great new features for iPhones, including Apple News, better battery life and split screen multitasking. But one feature that hasn't been talked about much may be eating through your data plan.

Wi-Fi Assist is a new feature in iOS 9 that automatically enables your cellular data plan whenever the wi-fi signal strength drops below a certain level. The feature is designed to tackle the "dead-zone" around your house, where your phone desperately tries to cling to your wi-fi signal, but isn't able to actually download anything.

However, many users have found that Wi-Fi Assist seems a bit overzealous in its desire to use your data plan, and will often use cellular data even when you're at home and the Wi-Fi connection seems fine, resulting in much higher than normal data usage.

Wi-Fi Assist is turned on by default. To turn it off, go to Settings, then Mobile Data. Scroll all the way to the bottom of the screen (past the apps) and you'll be able to toggle Wi-Fi Assist off.

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