For my current project, I need the ability to detect an incoming cellular phone call, (850 mhz - 1200 mhz). When this signal is present, a switch will be thrown to enable desired operation. I've been searching for this kind of component and just haven't found it. Doesn't necessarily have to be a sensing switch, just something that gives a state change on reception so I can wire in and use for the switch actuator. Thanks.