According to an embodiment of the present invention, a device configured to send and receive messages over a first network and a second network includes a network status detector unit and a network disabling unit. The network status detector unit is configured to detect the availability of the first network and output a first network status signal indicating the availability or unavailability of the first network. The network disabling unit is configured to receive the first network status signal and disable the sending and receiving of messages on the second network when the first network status signal indicates the first network is unavailable.