If you scroll down, you will see the cellular data usage, as seen in the middle panel. It’s important to note that these charts only show data sent through your cellular data connection and not your Wi-Fi connection.
- Set Data Limit
In addition to monitoring you can also set data warnings and limits by checking Set mobile data limit and adjusting the orange warning bar and red cut off bar to your liking when you reach the amount specified by the cut off limit, the mobile data for your phone will be disabled until you intervene.
Less obvious to most people is the fairly large amount of behind-the-scenes data churning through your connection the background data. Polling for Facebook updates, high-frequency email inbox checks, automatic application updates, and other background activities can use up a lot of data.
- Restrict Background data
In the Settings –> Wireless & Networks –> Data Usage section we highlighted a moment ago, you can click on individual applications to see a more detailed view. Here we can see the foreground and background usage:
You can turn off all background data this reduces your data usage immensely. From the Data Usage menu you can press the menu key and check Restrict background data. This will turn off background data for all applications.
Alternatively you can click on each individual application and scroll down to the bottom check "Restrict background data." Just note that this setting overrides any conflicting app behaviour.
A third option is to Restricting data via individual apps: If possible, you can often tweak settings in the individual applications. Rather than use Android to restrict Facebook’s data use, for example, you can jump into the Facebook app and turn down the frequency of push notifications or turn them off altogether. Not only does turning off notifications and constant polling cut down on your data use but it’s great for extending your battery life.
- Restrict app updates to Wi-Fi
By default, any apps set to automatically update will do so over both mobile data and Wi-Fi. You can change this by launching the Play Store app, pressing the menu button, and then selecting Settings –> Update over Wi-Fi only
N.B even if you heavily restrict an application it will still function normally when you are on Wi-Fi.
- Restrict app that use mobile data using app
Opera Max is a data-management and data-savings app that is available for android that makes it easier for you to decide which apps use data by the use of a GUI. It controls your apps internet usage by blocking apps from running in the background that are using mobile data or WiFi without permission. Blocking apps running in the background conserves battery and minimises your battery usage. It also shrinks videos and photos on almost any app on mobile data connections, as well as Wi-Fi.
- Switch to a Lightweight Browser
Switching from the mobile browser to browsers like Chrome beta or Opera Mini are alternatives that feature data compression and optimization to help reduce usage.
- Remove Ads to Decrease Data Consumption
Mobile advertisements are a surprisingly big data sink. You can approach the problem of mobile ads one of two ways:
- Buying an ad-free premium version
- Install an ad blocker: Buying an ad-free premium version isn’t always an option. In such cases tools like Ad block Plus and AdBlock Plus works on non-rooted phones but only for Wi-Fi based blocking; both apps need root access for 3G-based ad blocking.