apple iphone 4 new factory unlocked -

hi apple iphone 4 8gb got it from apple store in aberdeen on saturday 22,09.2012 brand new and simfree as my other one was faulty so only a couple of days old,comes boxed with charger usb,sim pin,instructions.still has warranty till april next year,looking to sell but may swap for another good phone in mint condition on o2 or unlocked,may even swap for a white iphone just fancy a change, no post etc or silly offers thanks