Mobile phone signal jammers are illegal in the US, but that doesn't mean they're not used. They're apparently increasingly common, and are expected to spread quite a bit in the near future. The FCC says that using a jammer is considered "theft" of airwaves, because that spectrum has been allocated as property to a commercial entity. The writer of the article wonders, though, about "passive jamming" - such as putting up buildings made of material that block out cell phone signals. While some don't like the idea of having their signals blocked - others think it may become a lot more popular in the future, if only to have areas to "disconnect". The article points to the rise of camera phones as a "bottom up surveillance society" as a reason why we might want areas that have no signal. That makes little sense to me, since anyone using a camera phone can still snap the picture, and then just upload it later when they're in range of a signal. Still, it will be interesting to see if anti-jamming equipment becomes popular. Most people have no idea if a jammer is being used, since it just looks like there's no service. This makes it very difficult to figure out if someone is using a jammer, and means that no one's getting caught using these things right now.
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