Businesses are at risk of losing confidential data to hackers asoffice workers leave their Bluetooth-enabled PDAs and mobile phones unsecured. A survey of commuters in three central London railway stations found that one in 10 are travelling with mobile devices that are open to eavesdropping by hackers.

Out of 943 devices identified at three London stations, 379 had been left on their default security settings and 138 were vulnerable to hacking attacks, known as Bluesnarfing.

Personal data including voice messages, address books, e-mails and diaries stored on mobile devices were extremely vulnerable to theft or manipulation, the company said.