In recent months, you may have noticed that your wireless bill has been going up as you supposedly go over the monthly data limit set by your carrier. This may be the result of Wi-Fi Assist, a feature Apple recently added to the iOS devices including the iPhone 6, iPhone 6S, and iPhone 6S Plus. This 2-minute iPhone tutorial explains in plain English how it works and shows how to turn it off. The narrator of the iPhone tutorial is Ian Lamont, author of iPhone 6 & iPhone 6S In 30 Minutes.