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Seventeen fake cellphone towers were discovered across the U.S. last week, according to a report in Popular Science.

Rather than offering you cellphone service, the towers appear to be connecting to nearby phones, bypassing their encryption, and either tapping calls or reading texts.

Les Goldsmith, the CEO of ESD America, used ESD's CryptoPhone 500 to detect 17 bogus cellphone towers. ESD is a leading American defense and law enforcement technology provider based in Las Vegas.

With most phones, these fake communication towers are undetectable. But not for the CryptoPhone 500, a customized Android device that is disguised as a Samsung Galaxy S III but has highly advanced encryption.

Goldsmith told Popular Science: " Interceptor use in the U.S. is much higher than people had anticipated. One of our customers took a road trip from Florida to North Carolina and he found eight different interceptors on that trip. We even found one at South Point Casino in Las Vegas.”

The towers were found in July, but the report implied that there may have been more out there.

Although it is unclear who owns the towers, ESD found that several of them were located near U.S. military bases.

"Whose interceptor is it? Who are they, that's listening to calls around military bases? Is it just the U.S. military, or are they foreign governments doing it? The point is: we don't really know whose they are," Goldsmith said to Popular Science.