By Sarah Kingsbury on Tue, 07/28/2015
Have you ever been watching something on Netflix with your iPhone or iPad only to realize the app was using cellular data instead of Wi-Fi? Most of us do not have unlimited data available, so that can be an expensive mistake. To avoid using data when you don't have to, it's a good idea to prevent data-gobbling apps from accessing data as their default setting. You can do this by turning off cellular data for specific apps, like video and music streaming apps, and changing the frequency with which apps like Mail fetch new data.