Blacberry 9900 black (Bold 4) for sale or swap with iphone ?

I want to sell my nearly new blackberry 9900 black (Bold 4) complete with box and accessories unlocked to any network. Just used it once as already got 3gs. It is £300 ono. It also can be swap with: 1) iphone 4 2) iphone 4s I will add some cash for anyone who want to swap with iphone 4s. I will only swap with iphone 4 or iphone 4s. so please no other silly offers and no time waster. cash on collection only. Text me on 07858384189