iphone 4s 64GB white unlocked Sale or swap for ( samsung galaxy s3 only ) no iphone 4 - htc +

Hi i have a iphone 4s white 64gb unlocked to sell or swap it is in really good condition. swap wise i am looking for a galaxy s3 only please do not offer me htc hd2 :) selling price is 500. please email and i will reply asap as i have email forwarded towards my phone. Thanks for looking