Weird & Wireless: Why do mobile phones cause noise on my office speaker phone?

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I have a lot of conference calls in my office where a number of us are clustered around a speaker phone. It is one of those spider shaped Polycom devices and it used to be, that whenever we were on a call, someone’s phone would cause a pulsing like noise on the phone.

It still happens today, but not as often and not as badly. You might think that we are getting fewer calls and fewer messages, but that’s not it. So what gives?

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