DataMan is great for monitoring your data usage in real time on your iPhone to stop overage charges. This is helpful for those on the limited data plans. This useful app monitors your cellular and Wi-Fi data usage in the background, keeping a log of your activities. To control your data consumption and stop additional charges to your bill, you can set your preferred usage thresholds and receive real time alerts when you exceed them. What's more, it geotags your data activities. So you can browse your daily activities on a map. You can even zoom in on the map to see the time and usage amount for certain places. Finally, it works with all carriers. There's no need to login to your carrier's website.