I have a Samsung G600 which works fine, is unlocked, I still have the original box and all of the accessories. I'm just, to be honest, looking for something new.
The only problem with my G600 is a slight scratch on the front (not the screen). With the crystal cover on (as it is), you can't even tell.
Only reason I want to get rid of it is that it's an expensive phone as it has the high 5mp camera which I never use as I stick to my digital camera, so it's a waste for me. The music functionality is key for me though.
Only worthwhile trades with other mobile phones please, a like for like (with possibly some cash coming this way) is what the doctor ordered!