iPhone 5 white 16gb NOT FOR SALE. ?

I currently have a white 16gb iPhone 5 but have decided i dont really like it anymore...wondering if anyone has a black one and would be interested in swapping? bit of a longshot but phoned o2 and they refused to swap it without me paying another £100... *****PHONE IS NOT FOR SALE***** preferably contact by text as I dont get overly great signal where I live