The best thing about this tool is that it's updated in real time and offers information on the last 30 days, so you can perfectly manage your monthly contract. You can see three results on the table: the data used from your cellphone company, the data used via WiFi, and the total of the two. This helps tell you if your home network works correctly, and makes sure you are using it instead of your data plan.
You can easily monitor your Internet activity by opening the app and checking the status of your connection. Another strong point is that you see the megabytes used on the notification bar at all times. This means you can check your data consumption in real time, and stop browsing if you need to save a few megabytes, or activate the WiFi connection if your device is not connected.