DataEye

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DataEye is an application aimed at helping you save mobile data and battery by allowing you to manage mobile data traffic. Read more about DataEye  

The application automatically detects the cellular network that you’re using and displays information on offers that you’ve activate or purchased, offers available now and the ones that are coming soon.
 
It allows you to block access to Internet for certain applications, so that when you enable mobile data they won’t be able to connect. It shows a list of apps that have attempted to access mobile data, but were blocked.
 
Moreover, DataEye displays a chart with data usage over the past hour, day or month. It also shows you which services use the most data and can help expend battery life by blocking unwanted background data drains. The app even works while roaming and comes with the option to enable service notifications.