From BusinessInsider.com:

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.

Read more: http://www.businessinsider.com/mysterious-fake-cellphone-towers-intercept-calls-2014-9#ixzz3CLxqM1zU