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The first virus designed to infect mobile phones was detected Tuesday, as reported by security firm F-Secure in Helsinki, Finland. Nicknamed Cabir, the worm uses Bluetooth technology running in Symbian mobile phones that support Nokia's Series 60 smartphone platform. Several mobile phone makers use Symbian, including Nokia. According to the security report issued by F-Secure, the Cabir worm can only reach mobile phones that support Bluetooth, have it turned on and are in discoverable mode.
There is an official report on the numbers of people vulnerable to bluetooth threats in London on this web page (PDF). The report is free.