DataMan iPhone app, the real time data usage manager with geotag. It's from AppAdvice.
"Simple, but powerful app to keep track of your data usage. You can track usage directly with your carrier, or use the built-in data-usage tracking feature on your iPhone. Yet, both are not very precise and don’t give you all the insight you might need. DataMan gives you all that and more. "
"If you need such statistics, there aren’t really any downsides to DataMan, and this is the app for you."
Thank you Mr. Alexander Vaughn from AppAdvice. Read the full review.