If your carrier has offered you a rather scarce data plan, you should take a look at this app called Onavo Protect VPN. It's one of the best applications that you can download to control the data consumed by the applications on your Android phone and it also offers us a VPN connection to protect our privacy.
This app allows us to individually manage each one of the applications we've downloaded so that we can establish data consumption limits, only allowing them to run when we're connected to a WiFi network and also receive alerts when they surpass the indicated consumption.
The best thing about this app is that we won't have to explore complex menus or anything similar: its interface comes along with a basic and simple design and the functions available for each app are down to three. These are its main features:
- Set specific alerts for apps when they consume too much data.
- Use a free and fast VPN to guarantee your personal information.
- Prevent apps from using data in the background.
- Limit the use of applications to when there's WiFi.