If you recently updated to Apple's iOS 9, you should probably head to your settings and switch off a feature called Wi-Fi Assist, especially if you have a data cap.

The feature essentially automatically switches to data when the user is experiencing less than ideal Wi-Fi connectivity. This is great, except for the fact that sometimes people are willing to deal with bad Wi-Fi connections to not have to pay outrageous data fees.

Of course, the feature is great for those with unlimited data. It saves users having to manually switch Wi-Fi on and off if their connection is bad, which can be very frustrating.

The issue is likely to affect millions of users, especially considering the fact that iOS 9 has already been installed on 50 percent of iOS devices in use. It's very easy to switch off the feature, however, with users simply needing to go to 'Settings,' then to 'Cellular.' Then, simply scroll to the bottom of the list to see 'Wi-Fi Assist.'

Despite the Wi-Fi assist problem, there are plenty of great aspects of iOS 9. The device, for example, features a much smarter Siri, as well as greatly improved battery-saving features. Last but not least is the new 3D Touch, which allows users to press lightly or slightly harder to access two layers of commands. Its an option which is only available on the new iPhone 6S and 6S Plus, but promises to revolutionize the smartphone industry yet again.

Via: Engadget