SWAP Samsung Galaxy S3 Pebble Blue Unlocked with Apple iPhone 4s Black +

Hi, looking to swap my 1 month old Samsung Galaxy S3 in Pebble Blue and factory unlocked to all networks, for an Apple iPhone 4s in Black. My Galaxy S3 is in pristine condition, comes with smart black slim bumper case, screen protectors, boxed with all accessories. Swap for iPhone 4s - must be in the same pristine condition, unlocked, boxed with accessories, preferably new/unopened or at least 9 months warranty. Will accept locked to T-mobile but must be new/unopened if that is the case. Meet at Canada Water Tube Station Friday eve or Sat afternoon for quick transaction.