Question

is there a possibilty to check whether the iphone is connected via Wlan, via 3g, via 4g or via 2g?! I know there is a reachability class from apple, but with that you can only check if Wlan or wwan…

switch (netStatus)
{
    case NotReachable:
    {
        statusString = @"Access Not Available";
        imageView.image = [UIImage imageNamed: @"stop-32.png"] ;
        //Minor interface detail- connectionRequired may return yes, even when the host is unreachable.  We cover that up here...
        connectionRequired= NO;  
        break;
    }

    case ReachableViaWWAN:
    {
        statusString = @"Reachable WWAN";
        imageView.image = [UIImage imageNamed: @"WWAN5.png"];
        break;
    }
    case ReachableViaWiFi:
    {
         statusString= @"Reachable WiFi";
        imageView.image = [UIImage imageNamed: @"Airport.png"];
        break;
  }
}

Answer 1

The cases you’re looking to identify belong to the WWAN (Wireless Wide Area Network) case.
There’s no official documented way to do this, but Here’s a solution that might do the trick , using private API on the status bar