Devuelve el tipo de accesibilidad en Internet que es posible actualmente en el dispositivo.
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.