samsung galaxy s2 SWAP 4 IPHONE 4s +

I have a black samsung galaxy s2 16gb which im wanting to swap for an iphone 4s preferbally white. Galaxys s2 is only arround 2months old and is is in good condition. A few minor scratches but nothing really noticable. S2 is boxed with all accesories apart from headphones. Text any questions. S2 is virgin but used on vodafone. I think its unlocked but am unsure.