I fully agree that "Faraday Cage" might be an inaccurate term for a car's body since you can still get cell phone reception. The cars metal body however would certainly change how the waves interact with the car, perhaps enhancing energy in some areas (due to reradiation) and perhaps shielding in others.
My condo is not a true "Faraday cage" either but I do have that old time metal reinforced plaster. I cannot get cell phone reception nor UHF/VHF. I can however get AM/FM. In a true Faraday cage I would get nothing. But that is not to say I am not slightly more protected.
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