SAMSUNG GALAXY S 1 ONE (((UNLOCKED IN BLACK))) £100 OR SWAP!! ?

I HAVE FOR SALE A UNLOCKED SAMSUNG GALAXY S 1 IN BLACK WITH A FEW PROBLEMS WHEN I TURN ON THE WIFI IT SAYS ERROR AND ALSO IT SWITCHES OFF FOR NO REASON SOMETIMES... APART FROM THAT EVERYTHING WORKS FINE , IM LOOKING FOR 100 OR SWAP!!! IF YOU KNOW HOW TO FIX IT YOU HAVE A DEAL CONTACT ME ON 07904791435