Essentially, it automatically switches between wireless VoIP and wireless cell phone provider to provide maximum cell service inside a building. The FMC3000 can be used as either a standalone wireless router, a wireless access point for existing ethernet networks, a wireless adapter for cable or DSL modems, or as a secondary wireless network added to an existing router. In all of these modes, the FMC3000 still provides the call-switching functionality in order to improve cell signal.