There's really only two types of companies or two types of people which are those who have been hacked and realize it and those who have been hacked and haven't." That's what mobile security expert John Hering tells 60 Minutes correspondent Sharyn Alfonsi about the danger of cellphone hacking. To prove his point, Hering assembled a group of ace hackers. Jon Oberheide showed 60 Minutes an app he created that looks legitimate but allows him to take control of a phone and suck out ... information [such as] contacts, recent purchases and text messages. Another hacker, Adam Laurie, uses radio frequency identification to hack phones. "He didn't need my phone number," Alfonsi explains. "All he had to do was physically touch my phone." He demonstrated by brushing by her in the lobby of her hotel. When he did ... her phone [automatically] dialed Laurie, allowing him to listen in on anything discussed in the room with Alfonsi's phone. A so-called "CryptoPhone" ... alerts the user when someone is trying to attack or hack into his or her phone. "Certain government facilities will try to get into your phone if you get too close to them," Alfonsi explains. To demonstrate, Les Goldsmith, CEO of ESD America, a company that specializes in countersurveillance technologies, took Alfonsi for a ride ... near a secure government facility. As they were driving past, a red line appeared on the CryptoPhone, indicating that ... if she were using a regular phone, the government agency could hear her call and read her text messages.