That virus is quite famous 1. I just forget the name only.

The earlier S60V1 and S60V2 is quite vulnerable to virus infection. If you open your bluetooth without using it, it can infect you silently.

What happen after it is infected?

like computer infected by virus I think.
Silent data corruption, lagging (this is the worst to happen on a laggy phone ) , or just total, boom 
Flashing software will cure

you got kena before? on 5800?

Unpleasant experience on the phone.

Anything happened when infected by the virus? Screen blank? Cannot use anymore?

I see. Nokia can keep because outside so many non original but high quality spare parts.

Those non original battery still have batteries for the Nokia 6670 as well. Depends on how you find it.

I think so... Nokia is very tough. 

If can, please wait until your warranty expire.

If can, just avoid changing the original stuff before the warranty is over.

Changing of the casing usually need to strips the entire casing out and I am not sure if the warranty seal will be affected since all the phones i get is without warranty.

Umm, i doubt they provide service to change the original housing to other housing.

If you send to the NCC, it won't void your warranty. However, you have to pay a premium price you know?

No.

Their service is not premium, it is the original parts.