Swap White Iphone 4 16gb for BB Bold 9900 +

Looking to swap my White 16gb iphone 4 mint condition 6 months old UNLOCKED to any network for a BB bold 9900 must not be scratched an in excellent conditon an unlocked an proof of purchase.. Iphone has no scratched due to back protector an screen protector I purchased the iphone off here so not receipt. Swapping due to having a ipad so dnt need it for app etc now.