Samsung Galaxy S3 swap for iphone 4s or cash ?

looking to swap a Samsung galaxy s3 this is pebble blue and comes with a silicone case which is white this is new and only been used a couple of times for games the phones is two big for me comes with box and every thing in it will swap for apple iphone 4s or £400 cash but the iphone 4s must be under warranty and proof its under warranty as well please only message me if ya going to swap or give cash no paypal no time wasters can meet at gateshead metro only as i walk every where