iphone 3gs black 8gb *Boxed all accessories* Stevenage * on O2 ?

iphone 3gs in great condition everything works perfect, boxed with all the gear (and a sim pin - not pictured) some very light marks to the back as per normal, screen perfect, one tiny surface mark under home button, cosmetic blemish only currently on O2 - though it can be unlocked - I have upgraded Collection Stevenage Herts Rich 07598 863175 or 07771 981962