How to know is iPhone device have 3G network or Wifi network thorugh iPhone sdk?

I want to开发者_如何学JAVA know if my iPhone has a network connection. But what I didn't get is if the connction is Wifi or 3G thorugh SDK. Can any one help me?

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You should be able to get the model through the SDK. You should be able to use that to find out the specs.

Edit: Expanding answer in response to comment

 #include "Reachability.h" 
 Reachability *reach = [[Reachability alloc]init]; 

AND THEN check the internetconnectionstatus.