What does a cosmetology school just outside Dallas need with a 5W adjustable cell phone jammer? Blissful quiet in the classrooms, apparently. But the school's decision to install the jamming unit (it had three more that weren't yet set up) in 2009 was one link in a chain that last week led the Federal Communications Commission to propose a $25,000 fine against the company hawking the products. London-based Phonejammer.com has actually been in the FCC's view for some time. Back in 2008, the agency issued a citation to Phonejammer (PDF) for "marketing in the United States radio frequency devices designed to ...