Moblie virus

Is there such things as a mobile virus, i haven't seen or heard about a Mobile virus but that cypher the descriptions of a malwareattack. But it is possible and surely that a Mobile web browser user on any 3g network can in fact be stored on the Mobile it's self. Hidden or seen as an .exe file that users are unaware of, the download of these files are yet again stored in the memory of the phone. A worm virus will duplicate it's in other system files of the phone. When the Mobile is connected to the a computer the virus will spread on the users computer and infect the computer it's self. A scanning is required before copying or transfer the files in order to deleted the threat.