APPLE IPHONE 4S 16GB BLACK SWOP FOR GALAXY NEXUS OR GALAXY S3 ?

HI I HAVE A IPHONE 4S 16GB BLACK BOXED WITH EVERYTHING ON VODAFONE NETWORK. WOULD LIKE TO SWAP FOR A SAMSUNG GALAXY NEXUS PLUS CASH MY WAY OR STRAIGHT SWAP FOR A GALAXY S3 CAll OR TEXT 07768669502