A mobile communication device (MCD) in a network uses a land mobile radio (LMR) transceiver to facilitate voice communications through an LMR network to a dispatch center. A broadband cellular network (BCN) wireless modem in communication with the MCD implements a BCN wireless communication protocol for broadband data communications between the MCD and a remote dispatch center. When a BCN access interruption occurs, the MCD will automatically communicate to the remote dispatch center a notification of the BCN access interruption, by using the LMR network, and data otherwise communicated through the BCN is automatically communicated through the LMR network.