Using Droid wall android apps you can firewalled your android devices either phone or tablet. This is a very good application that do the job as described by app, you should be rooted to use this application. Using Droid wall you can select which application do you want to give internet access or for which deny the internet access. This application not only save your data usage and battery also safe your device from hacking, and unauthorised access that may cause by any new unknown apps inside your android device.
To use the apps just very simple after installing from play store, press menu key and enable firewall, when asked root permission just granted. After you can select application you daily use and familiar to you, e.g. browser, calender sync, contact sync, email app, gmail, play store , messaging. The only apps selected will be granted internet access through wifi or 3g, now save your option using menu key. If you install any new apps that require a working internet connection than enable the apps through Droid wall.
Download Droidwall from play store- click here.