Details

This screen lists all apps with network traffic over a user-defined period of time.

Tap the top-right filter button to cycle between user-installed, system pre-installed and all apps.

Tap the network type button at the bottom (middle) to cycle network type between: All, mobile and Wi-Fi. Since Android 6, VPN is no longer available (!?).

Tap the sorting button at the bottom (right) to cycle sorting between total, received and sent.

Tap the left bottom button to select period to display. Available periods are: since boot, this (billing) cycling, last cycle, this week, this month, this year, last week, last month and last year.

Note that billing cycle start day must be set in network settings otherwise it defaults to first day of the month.