White Samsung Galaxy S3 - Wanting to swap with an iPhone 4S ?

I have a white samsung galaxy s3 on vodafone - its boxed with everything that came with it, a couple of covers and some screen protectors. Its only just over a month old so in perfect condition. Im wanting to swap for an iPhone 4S - needs to be on Vodafone, boxed and in perfect condition. Pls tx if interested - no calls thank you