Returns the type of Internet reachability currently possible on the device.
This property is mostly useful on handhelds to distinguish fast and
cheap WiFi connection from carrier networking.
Note: Do not use this property to determine the actual connectivity. E.g. the device can be connected to a hot spot, but not have the actual route to the network. Non-handhelds are considered to always be capable of NetworkReachability.ReachableViaLocalAreaNetwork.