iPhone: Why You Should Turn Off Wi-Fi Assist!
iOS 9 included a new feature called Wi-Fi Assist, which uses cellular data to boost a poor WiFi connection. Wi-Fi Assist is turned ON by default which, depending upon your carrier and data plan, could be costly! You could be using cellular data without realizing it. Here’s How to Turn Off Wi-Fi Assist: https://support.apple.com/en-us/HT205296