Thanks guys for reply, I will try some of the mentioned methods

As it's seen in posted youtube video, pasting "w" to dialer won't just work. This character is omitted there, no matter the source (on some other forum, guys were trying sending the code via message - still doesn' work).

I think I will try flashing.
I just want my N9, don't need the varranty

I think, and I'm afraid of this, that there is no such thing as "unlock-operator-lock" code for N9s. There are a couple of sites on the web trying to steal money from people who are just unaware of this problem