For sale or Swap my Samsung S3 in White for a 32-64gb Iphone 4s ?

Hi, I have a Samsung S3 on 3 which i have been told is easy to unlock to any network. My phone is pretty much brand new (Between 1-2 Months) old and i tried it rather then a Iphone again....but i like my iphones more. I would like to swap it for a 32/64gb Iphone 4s in White or would consider Black. Please dont text or call with offers of other phone i only want to swap for a iphone of about the same age of mine and the gb i have stated. Please call after 5 as i am at work during the day.