In the two pictures below, the only thing that has changed from one shot to the other is placing the DIY Faraday cage over the phone. As you can see, the phone had a signal strength of ...

However, a compass does work inside a Faraday cage because the cage does not block the earth's magnetic field. Constructed of a metal mesh, current is conducted on the cage itself. It was invented ...

A radio is able to receive signals and make sound when outside a Faraday cage. The cage blocks the signals when placed over the radio, silencing it. The cage gaps are on the order of centimetres, but ...