How to disable iPhone feature that could cost you hundreds of dollars

Apple added a new feature to iOS 9 that could cost people with limited data plans hundreds of dollars.

The feature, called "Wi-Fi Assist," automatically switches the device from a Wi-Fi network to a cell network if it detects a weak Wi-Fi signal.

Depending on your location, this feature could be activated more often than users realize.

If you have a limited data plan and you're worried about overage charges, here's how to disable the feature:

1. Go to "Settings"

2. Open the "Cellular" menu

3. Scroll to the bottom and disable "Wi-Fi Assist"