Nokia 6680 Viruses?

Hi. I have been told that it is possible for this phone to be infected with
viruses that can render it unusable. Can someone please explain to me how
this can occur and what needs to be done to safeguard? Does it need
something like antivirus to be installed? Where can you get that if so?
What's next? Firewall & Antispyware?
Thanks.

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"Whether it's god or the bomb,
It's just the same,
It's only fear under another name."
Max Q.