1 week old Samsung galaxy s3 unlocked swap for iphone 4s ?

Hi there, I have a 1 week old Samaung Galaxy s3 in pebble blue, unlocked to all networks, and in mint condition. Ive just bought a new Mercedes and it has a built in iphone carkit, so Id like to swap for an iphone 4s preferably in white, although black is also fine. Must work on vodafone or be unlocked, and in mint condition.