Opens to the start screen of the Huawei P8 the menu, then:
Settings -> All -> Display
In this submenu a piece scroll down until you see the option "Show grid operator name."
You can now activate the option on or off. Disables the function to hide the network operator name in the status bar of Huawei P8 when the screen is unlocked.
You know now how to hide the network operator name in the status bar of Huawei P8.