I'm pretty sure they tested this out and modern refrigerators don't act as Faraday cages: http://mentalfloss.com/article/51597/does-refrigerator-make-good-fara

I'm pretty sure they tested this out and modern refrigerators don't act as Faraday cages: http://mentalfloss.com/article/51597/does-refrigerator-make-good-faraday-cage http://mentalfloss.com/article/51597/does-refrigerator-make-... Older ones might have been lead-lined or otherwise different; you might have better results with a microwave. That said, it's a pretty good guarantee that the phones are not surreptitiously recording a conversation.