Blackberry Bold 9900 in White Looking to swap for iphone 4 or i wud sell £300ono for my blackberry -

hi i have a blackberry bold in white on o2 but ithink its unlocked to any network looking to swap it for iphone 4 must be on o2 or unlocked to any network i wud prefer white or if u have a black one .my blackberry has a few scratches on the back none on the front and has still got the screen protector that came with the phone on i wud sell my blackberry for 300ono ..