Hello, iOS developer here.

Some of the data I'm able to see contains location (Country). I don't know much more than that, however, there may be tools that you can build into your app to discover such data (if you do this, please let the user opt-in).

This article may be of help: http://www.dummies.com/how-to/content/tracking-the-success-o... - I personally use AppViz which makes viewing data much more convenient.