Netflix uses a lot of data, about 1 GB per hour while watching standard definition content. If you’re on a mobile connection with a data cap, which most people usually are, then that’s way too much.
In order to rein in how much data your phone or tablet is using on your mobile connection, you first should make sure that you have the very latest Netflix update. You can find it in the App Store updates if you’re on iPhone or iPad, and in your Play Store updates if you’re using an Android device.
First, tap the three lines in upper-left corner to access the slide-out panel.