For Liars and Loafers, Cellphones Offer an Alibi

The New York Times > Technology: " Cellphones are chock-full of features like built-in cameras, personalized ring tones and text messaging. They also gave a real boost to Kenny Hall's effort to cheat on his girlfriend. Mr. Hall, a 20-year-old college student in Denver, decided in March to spend a weekend in nearby Boulder with another woman. He turned to his cellphone for help, sending out a text message to hundreds of other cellphone users in an "alibi and excuse club," a network of 3,400 strangers who help each other skip work, get out of dates or give a loved one the slip.

There is nothing new about making excuses or telling fibs. But the lure of alibi networks, their members say, lies partly with the anonymity of the Internet, which lets people find collaborators who disappear as quickly as they appeared. Engaging a freelance deceiver is also less risky than dragging a friend into a ruse. Cellphone-based alibi clubs, which have sprung up in the United States, Europe and Asia, allow people to send out mass text messages to thousands of potential collaborators asking for help. When a willing helper responds, the sender and the helper devise a lie, and the helper then calls the victim with the excuse — not unlike having a friend forge a doctor's note for a teacher in the pre-digital age.

Another new tactic is the use of audio recordings that can be played in the background during a phone conversation to falsify the caller's whereabouts. Phones can be equipped to play, at the press of a button, the sounds of honking horns, ambulance sirens or a dentist's drill. An employee who is actually sitting at the beach might be able to call his boss, play the blaring tones of a traffic jam, and explain why it has been impossible to get to work on time. "It lets you control your environment," said Harry Kargman, chief executive of Kargo, a New York company that plans to begin selling in July a variety of cellphone sounds for $2.99, including the rasp of a hacking cough to simulate lung infection. "It's not necessarily malicious or nefarious," Mr. Kargman said.

Mr. Katz said there was practically an arms race between the technology used to locate people and track behavior — global positioning systems, for instance, and caller ID on phones — and technologies intended to deflect surveillance, like audio for fake background noises. "