A man uses a smartphone
A man uses a smartphone to perform various tasks in New York. Reuters/Natalie Behring

Apple keeps insisting to iOS 9 users that its new Wi-Fi Assist isn't using up mobile data without their knowledge but this didn't prevent it being hit by a class action lawsuit filed in California that claims the contrary is true.

This new software feature is the Cupertino-based tech giant's attempt at keeping its users' Internet connection going even if the Wi-Fi coverage is very poor. Apple's support website, however, warns customers they "might use more cellular data" if they leave Wi-Fi Assist enabled. Mobile operators charge large fees if data allowances are exceeded.

The lawsuit alleges the plaintiffs accumulated large mobile data bills because they used Wi-Fi Assist. The plaintiffs said Apple didn't properly explain the potential consequences of using Wi-Fi Assist and are apparently asking for US$5 million in damages, said the BBC.

The Wi-Fi Assist feature is turned on by default. Whenever a Wi-Fi signal is weak, cellular connection is automatically accessed. This feature was first introduced to Apple device owners in September. Judging by its features, it would seem this new capability is a great one to have.

When iOS 9 users first found out about it, there were some who became worried that their mobile data -- otherwise referred to as cellular data -- could be eaten up by the app. Apple has answered their concerns.

Still, Wi-Fi Assist hasn't been spared from controversy. There are users that believe the feature uses up their cellular data without their knowing about it. This controversy could be problematic for users that have a mobile plan only allowing for a limited amount of data, such as the 1 GB per month plan.

There are others, however, that are impressed with Apple's new Wi-Fi Assist. CNET has reported many users praising the feature because its mobile data usage is relatively small. Also, Wi-Fi Assist is very convenient since it automatically functions in spots where the Wi-Fi signals drop.

Apple has come up with a whole web page -- About WiFi Assist page -- dedicated to explaining how the feature works. iOS 9 users don't have to pay additional fees whenever they're out of their normal coverage area since the feature won't work if the user uses data roaming.

The feature will only work with the user's apps that are already running. That said, Wi-Fi Assist won't automatically download new content or updates from the apps that are only in the background and are not being used.

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