Apple has been sued for eating up data bandwidth on your iPhone without your permission, and without notifying you of doing so. The controversy began when several users discovered an iOS 9 function – Wi-Fi Assist – was running on their iPhone 5 and 6 models.
In theory, this function was created to help you in case a problem arises with your connection. The issue is that it’s activated by default, without your knowing it. The result: Wi-Fi Assist never stops consuming your bandwidth.
The plaintiffs (William Scott Phillips and Suzanna Schmidt Phillips) are demanding $5 million from Apple as part of a class action law suit. It happened to both of them with their iPhone 5. It’s not known exactly how much data Wi-Fi Assist uses. Apple has included a tutorial on its website about how to disable this function, but neither announced this, nor disabled it by default.
In order to disable the function, you just have to go to Settings, and from there to Cellular/Mobile Data – depending on your location. Finally scroll ALL the way down, you’ll see the option for Wi-Fi Assist. Don’t see it? That means you have an iPhone 4S, an iPad 2, or a first-generation iPad mini. This function is unavailable for those devices, so you’re safe.
Source: TechRadar