Security code on nokia 6500 slide

[Lolunia]

Hi I have nokia 6500 slide on 3 network, recently brought LG viewty.
I want to give the nokia phone to my brother but when his simcard (also on 3) is in, the phone keeps asking for the security code.

We have tried 12345 and 00000 but it doesen't work.
Seams like somebody had to change it.

How do I reset this code?

[hittingray]

Find out how to do a hard reset on S40 phones. And that should reset the security code.