Huawei Mate 8 - Manual (Page 176)

Phone Manager – round-the-clock protection for your phone
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2
Touch System optimization to scan for and clear cached app data and system trash.
Follow the onscreen instructions to manually clear files or configure the settings.
3
Touch Finish to exit.
Managing data usage
Phone Manager comes with a data management feature that you can use to monitor data
usage and avoid exceeding your monthly allowance.
Open Phone Manager, and then touch Traffic manager. You can view detailed data
usage statistics, or configure the following settings:
Configure automatic cleanup and
reminders
Exit cleanup
Clean up files and uninstall apps
by type
Delete app usage records