This is the perfect solution to control and supervise your network usage. With a lot of useful network stats, iNETMeter is the App you need to monitor your Internet connection.
A great Application that uses your status bar to show your network speed (download and upload) in real-time, and clicking on it, you can access to a lot of extra info, such as your public IP, data downloaded and uploaded, and more.
* Special thanks to Ángela García Jiménez for helping design creation.