You should change this one setting on your iPhone if you want to save data

• If you want to preserve your iPhone's data, try turning off Wi-Fi Assist.
• This feature automatically switches your phone from Wi-Fi to data if your Wi-Fi connection is slow.
• Here's how to do it.
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Since you probably use your phone for everything from watching Netflix to browsing Facebook and getting directions from point A to point B, it can be easy to breeze through your data plan unknowingly.

But there are a few steps you can take to better manage your data usage. One such trick is by turning of Wi-Fi Assist, a feature that automatically switches your iPhone to a cellular connection if you're on a sluggish Wi-Fi network. Apple added this feature to the iPhone when it launched iOS 9 in back in 2015 to make it easier to keep using the web and apps when Wi-Fi is slow.

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However, if you're really trying to cut back on data usage, you might not want your iPhone to automatically switch to cellular service without your knowledge.

Wi-Fi Assist is on by default. Here's how to turn it off.