Growing threat to most of the mobile viruses, worms and trojans are aimed at Symbian's operating system, particularly its Series 60 version, largely because it is used on a majority of smartphones.The more handsets we see with a common open operating system, the more skill the virus developers have and the more damage they can do. Some of the viruses will stop a phone working if they are installed, others try to spread from one phone to another via the Bluetooth short-range radio service. New 10 mobile viruses found: lasco, skulls, cabir, commwarrior, drever, locknut, dampig, mabir, fontal and hobbes.