She told the blog Philebrity: 
 
 While riding the bus, my cell phone signal suddenly went out, which is not normal, and continued to search for a signal for 15 minutes. Not only does he admit doing it, he thinks it’s a good thing. The man, who calls himself Eric, told the NBC10 Investigators, “I guess I’m taking the law into my own hands, and quite frankly, I’m proud of it.” 
 
 Eric says he doesn’t want to hear people talking on their cell phones in public. “When I've used it, it’s to cut off a loud talker on the train that's sitting near me.” He says he bought it online from a website that imports the devices from China, where they’re legal and, when asked, told me he’s never felt guilty for keeping his fellow rail riders from conversations. “No guilt,” he says, “Just personal high fives.” 
 
 “I always have a grace period with phone calls,” says another jammer who rides the MARC train into Washington DC,roughly 30-minute ride. He’s openly holding something that looks like a walkie talkie with four antennae in his hand the whole time.  A Philadelphia man was caught red handed this week for using a cell phone jammer to keep his fellow passengers on a public transit bus from using their cell phones. A jammer, which blocks radio frequencies, isn’t just limited to blocking personal cell phone use, but all communication tools that use these frequencies. Essentially that the jammer that lessens the din of personal conversations on your M-14 bus also has the potential to cut off communication between the driver and dispatch centers or public agencies, which could result in a public safety snafu—or disaster. “Well, of course if there were such a situation on the bus, I imagine I would be right in the middle of it. And I would imagine that would be a very different situation, of course; I’d imagine I’d be dialing 911 myself," Eric said. He doesn’t keep it on for the entire ride, he says, just when a fellow passenger talks “too loud” or “too long.” “It fits in your pocket - they even make shady ones that look like packs of cigarettes. Just hours after the NBC10 Investigators told Eric that the cell phone jamming device was illegal, he called to say he did more research and discovered that what they told him was true and he would dispose of the device.
– Riders of Philadelphia's No. 44 bus have been complaining a lot lately of lost cell phone calls, and NBC 10 found out why: A man, whom they identify only as "Eric," is jamming them. Reporters tracked Eric down after an NBC employee saw him using a handheld jamming device on the bus. "I guess I'm taking the law into my own hands, and quite frankly, I'm proud of it," he told them. "A lot of people are extremely loud, no sense of just privacy or anything." Of course, such handheld devices are illegal, and with good reason, experts say: They can block not only cellphones, but radios, GPS devices, and emergency frequencies as well. "You have the potential to cause a public safety disaster," says one expert in electronic crime. But illegal or no, these jammers are catching on; Forbes reports that they're especially common in New York and Washington, DC. "They’re the best thing ever," says one New York commuter and jammer, who says he feels "no guilt, just personal high-fives."