iphone 4s simfree unlocked £400 !

hi for sale is an iphone 4s 16gb in white. comes with all accessories. usb lead and headphones still sealed now phone was originally bought simfree from apple so is unlocked to all networks plus when phone was bought the warranty was extended for another year which expires in october 2013. phone was replaced by apple under warranty in feb so is only 5 months old. comes with receipt to prove this phone has had a screen protector on front and back since new. has some light marks on the silver bit from general usage but these can only be seen when looked for 07712639119