You can use 360 Mobile Security to analyze and optimize inactive apps that are running in the background, or to clean up your browsing history. Each action can be performed with just a couple taps on your screen.
360 Mobile Security also allows you to block phone numbers so that they can't call or text you. Just enter the number in question, or select its entry in your contact book, and the app will take care of the rest.
Another interesting feature included in the app enables you to make a backup copy of your contact book so that you can save and import it to another device.
360 Mobile Security is a good security suite that helps you keep viruses out while providing a range of other useful features for your Android device.
Requires Android 2.2 or higher.