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Originally Posted by MSD
There's so little need for cell phones in a hospital with phones in every room that it's better to play it safe and ask for the phones to be turned off. While a Faraday cage would do the trick, it could also interfere with stuff that needs to plug in and instruments that need to communicate with each other wirelessly. If nothing else, it's a damn good reason to get the assholes to turn off their cellphones in the hospital where they're irritating and disruptive.
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Exactly. It's not that there's a high risk of cellular phones causing interference to the machines so much as it is that there's no need for them there. Given the potential consequences and that there's no need for a cell phone in a hospital anyway, the rules err on the side of caution here. In addition, many devices (such as heart monitors, etc) communicate wirelessly with each other and with the nursing station, and cell phone interference on the wrong frequency has the potential to cause problems with that.
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