A potential loophole in security for Bluetooth phones, which could see strangers hacking into your address books, has been uncovered. BBC reports that researchers have managed to steal information including address books and images from handsets by exploiting shortcomings in Bluetooth security.Adam Laurie of security firm AL Digital has created programs that run on a laptop which scan for Bluetooth handsets and exploit two vulnerabilities to suck down data from phones. This vulnerability has been found on the SonyEricsson T68i and T610 phones and the Nokia 6310 and 7650 handsets. He calls it bluestumbling.