DataMan for iPhone is a utility that allows you to monitor your data usage in a few unique ways that a lot of other data utilities don't. The app not only monitors your network usage, it will also monitor your wifi usage. You can also view your usage on a map. It will break up where you are using data and what kind of data you were using. For people who want to save a bit of cash and use a lower data plan, this may be an app you would want to check out.

iTunes Link

When you first launch DataMan, you'll notice the app is dead simple to navigate through. The layout's pretty intuitive and easy to use. You can enter your usage period (billing cycle) as well. For me, my usage cycle starts over on the 4th of every month, so I set it to begin on the 4th and end on the 3rd of the following month.

DataMan also allows you to set alerts for different usage levels as well. This way, the app will send you a push notification when you reach certain data usage levels. I also really like the map feature. It will link together all the different places you've used data. Not exactly a "needed" feature for most, but it's certainly neat to see the trends and where you browse the most. The data will not only break up into a total amount, but into how much you're using each day of the month. As you can see in the screenshot above, it also lets you know how much of that data is downstream and how much is upstream.

Some of my friends or family members are on 200MB plans with the iPhones and like to monitor their usage pretty closely. While AT&T allows you to check your data via text, their numbers are always a day to two days behind. Since DataMan monitors data as you use it, you'll always know exactly how much data you've used in real time.