With all of the mobile carriers moving to tiered data plans those with new contracts are having to keep track of data usage. Now that there are so many streaming movie and music services like Netflix and Pandora data can be an expensive issue. While most of us realize that by connecting to Wifi when available we can avoid ever going over it could still pose a problem for some.
Ice Cream Sandwich has a Data Usage feature that is a built in monitor for your data. What this feature will do is let you know specifically what apps are using most of your bandwidth and how much you have left. It will also let you know and disable mobile data when you hit a defined limit. Not only can you see data usage on a per app basis but you can control what apps are allowed to use mobile data.
This is the most user friendly useful feature Android has ever had included for the average user. This gives users that have a minimal knowledge of their Android device more control than they have ever had in the past. Also not having to root a device to get these features it a plus in itself.