Blackberry 9900 for sale. 350 pound or swap for an Iphone 4/4s. ?

Here I have for sale my Blackberry 9900 which is in excellent condition. The phone is black and will come with the charger, usb, and box. The phone is only a couple of months old and as I have said, it is in excellent condition. The price is 350 pound or ono. Or I am willing to swap for an Iphone 4 or 4s.