Mobile devices are inherently tools. Because of this, many developers have created tons of tools for them that work very well. There are many system programs and utilities for Android. You can do a whole bunch of things with Android.
Apps are useful for many reasons. It shows when applications are using the data. This is useful for many things. First, those using layered data plans can see exactly where their data went. It's also useful for security purposes because you can see when apps are sending data back to their home servers.
You also get customizable data alerts, a real-time data usage graph, and other customization features. It is ideal for those with tiered data transfer plans as well as security conscious people.
Utilities allow you to manage the settings of your mobile device. Control over the productive part allows you to optimize your work, and transform your mobile device into a more useful gadget.