Series 60 users beware. Kaspersky Labs has just discovered the Troja-SMS.Symb.OS.Viver which is the first Trojan for the S60 OS. It can easily be downloaded from the Net and unknowingly installed in your phone. Users may download it unknowingly as the trojan could be labeled anything from a picture editing software to a codec of some kind.
The Viver virus has been specially designed for the S60 Smartphone OS. What it primarily does after being installed, is send out SMSes from your phone to premium SMS numbers, the ones that cost more than just 50 paise or 1 buck.
It's a simple set up for the author. SMSes would be sent to a premium number that's rented by the author thus generating his income. So if you’'e a regular download junkie of freeware from the internet for your phone, you may want to think twice. Let's just hope the guys down at Kaspersky can come up with something to take care of Viver ASAP.
Get more information here.
Good thing I have a Sony Phone. No virus has come out for Sony phones yet. And even if I download one by mistake it cannot do any damage. That is why "No one can beat a Sony". 
