How to identify whether the current data network is Edge or 3G on iPhone

Is there a way to figure out the current data network available on iPhone? Whether it is EDGE or 3G?

It works for me even if its doable using core telephony private framework. I am not bothered about app store submission.

I know its very simple to identify whether the user is on Wifi or CellData network. But not able to find a way to identify the network type among edge or 3g?

Pleas also comment if you know a good core telephony documentation/tutorial to refer t开发者_如何学JAVAo.

I've never investigated this, you could try to start from the Rechability example from Apple http://developer.apple.com/iphone/library/samplecode/Reachability/