Huawei Mate 8 - Manual (Page 33)

First use and initial setup
26
Using mobile data
Before using mobile data, ensure that you have a data plan with your network operator.
1
Swipe down from the status bar to open the notification panel.
2
In the Shortcuts tab, touch to enable mobile data.
When you don't need to access the Internet, disable mobile data to save battery
power and reduce data usage.