Free DataMan Lite - real time data usage manager
There's now a free version of the highly acclaimed iPhone app, DataMan.
You can use the DataMan app to precisely track your data use in real time. This useful app monitors your cellular and Wi-Fi data usage, keeping a log of your activities every 10 minutes. This helps you to verify your carrier's records. What's more, it geotags your data activities. To help stop overage charges, you get alerts the moment you exceed your usage thresholds, without having to open DataMan. There are 4 levels of alert thresholds that you can customize.
You can find the free DataMan Lite in the App Store. http://j.mp/dmanlite
DataMan is compatible with iPhone, iPad and iPod Touch running iOS 4.