It's hard to believe, but you are wrong coderus that time. I bought few n900 and n9, and some of them(both 16gb n9 and n900 were simlocked to Orange (I got Orange, while my wife Plus GSM, so it's easy to check). Some auctions with n9/n900 also mentions PlusGSM dimlock, but never bought one of them.
I even think that at least 1/3 (if not 1/2) of n9 and n900 in Poland is simlocked to Orange, because in my country phones are usually bought on contract or second hand, and main provider for both phones were Orange(which similary to T-Mobile[and unlike Plus] nearly always gives phones with simlock.