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I remember hearing that jamming devices were quite common in some areas in Japan. To avoid the constant ringing of phone in movies, among other places. It worked by jamming the control channel of phone, so no calls could be made or received.
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I remember hearing that jamming devices were quite common in some areas in Japan. To avoid the constant ringing of phone in movies, among other places. It worked by jamming the control channel of phone, so no calls could be made or received.