Wi-Fi Assist is meant to give you a more consistent internet experience. If your connection drops out, Wi-Fi Assist tells your iPhone or iPad to use the cellular network as a backup. On the surface, this sounds helpful, but it also means that if your Wi-Fi connection weakens, you could go over your cellular data allotment. Sometimes it looks like you have a strong Wi-Fi connection, but don't really and your iPhone or iPad could be using cellular data. Here's how to turn this feature off.
1. Open the Settings app.
2. Tap Cellular.
3. Scroll down to the bottom and toggle Wi-Fi Assist off.
Now iOS will no longer automatically switch to using your cellular connection when the Wi-Fi has connection problems. Don't worry, you can toggle it back on if and when you need it later.
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