By Roman Loyola
In iOS 9, there’s a new feature called Wi-Fi assist. When you’re using a bad Wi-Fi connection, it switches over to cellular data. If you have an unlimited data plan, it’s no big deal. But if you do have a data ceiling, you may unknowingly blow past your limit, and that can cost money.
Here’s how to turn on and turn off Wi-Fi assist in iOS 9.
Access Wi-Fi Assist setting
Tap the Settings app to launch it.
Scroll all the way to the bottom, past the list of apps that use cellular data.
You should find a setting for Wi-Fi Assist. You can switch it on or off.
Read more here:: How to turn off iOS 9's Wi-Fi assist to save your data plan