Monitor your wireless data usage
You can check how much data you have used over your mobile network or your Wi-Fi network. You can also monitor which
apps and services are using the most data, and you can close some apps to help reduce your data usage or improve the
device performance. Depending on your wireless service provider, this feature might not be available.
On the home screen, swipe down from the top of the screen.
Settings > App Manager > Device Monitor.
Tap Mobile Data or Wi-Fi.
Tap an app or service.