Don't talk to strangers

Cell phone virus? Yep, the first one is out. At least it won't spread to far, only about 30 feet at a time. To get infected you have to have a cell phone running the Symbian OS and have BlueTooth on, and be foolish enough to accept an incoming transmission that you didn't initiate. Noone would ever do that, right?

CRN article

My own speculation goes like this... When these things get really intelligent they'll be infecting your camera phones over the cell networks and be keeping an eye on everything through your own lens. Talk about Big Brother...