Mobile Phone detectors
Does such a device exist? Mobiles operate within a known frequency range, and will transmit regularly even when not in use (on a smaller band of frequencies too) to keep contact with the network. Surely it's not beyond us to produce a device which can detect transmissions and illuminate a warning in the cockpit? Or is it just that it's a non-problem in reality, so it's not worth investing any money in? I've no axe to grind here either way, just interested.