Russia's virus writer has made another variant of Commwarrior virus, which is named as Commwarrior.C by F-Secure. Commwarrior.C is a Bluetooth and MMS worm that is similar to Commwarrior.B, but also has significant new functionality.

The Commwarrior.C is capable of spreading over Bluetooth, MMS and MMC cards that are inserted into an infected phone. When Commwarrior.C infects a phone it tries to change the operator logo to it's own. This behavior has been observed on Nokia 6600, where the logo is changed to "Infected by Commwarrior"

No matter how, to be infected by virus the phone users will have to first agree to install the application. So just be careful when you accept files on your symbian phone.

More Commwarrior.C info here

http://www.f-secure.com/v-descs/commwarrior_c.shtml