it's been reported all over the place, here is how Nybble covers it...

_________FIRST MOBILE PHONE VIRUS_________
http://snipurl.com/77lq

The first ever computer virus that can infect mobile phones has been discovered. The virus - called Cabir - is a proof-of-concept worm that replicates on Symbian phones. This worm repeatedly sends itself to the first Bluetooth-enabled device that it can find, regardless of the type of device. For example, even a Bluetooth-enabled printer will be attacked if it is within range. The worm spreads as a .SIS file, which is installed into the APPS directory.

If the virus succeeds in penetrating the phone, it writes the inscription 'Caribe' on the screen and is then activated every time that the phone is turned on. There is no payload, apart from the vastly shortened battery life caused by the constant scanning for Bluetooth-enabled devices.

as far as symbian devices go, i don't see how this could ever become much of a problem... the Symbian OS started life as the EPOC OS, which is what the psion model 5 and up used, and, unless symbian has changed it drastically for the worse, it should simply be a matter of deleting the errant files...
i have had more than a couple applications i installed wreak varying degrees of havoc on my 5 and all i had to do was hit my System/Apps folder, get rid of the application's subfolder, then go to Apps/Install and get rid of the .sis installation file... worst case scenario might involve searching for any files the app tries to hide (can't really hide things very well with such a transparent directory structure) and/or running a spy prog to find all running apps... hell, just popping up the list of openly running apps should be enough...
given that these are the sorts of tasks any user should know how to do, plus the fact that this new app running and draining battery power should be very noticable, i just don't see how this could ever be a real problem...

maybe i am missing something...