Iphone 3gs 16gb And Cash Swap for Iphone 4 (02) ? How much cash? -

Iphone 3gs 16gb unlocked with box charger and manuals...Its in ok condition the screen is mint. The screen has a thin white line on it i am talking about lcd however no cracks or nothing you can hardly tell its there If pictures are needed let me no and i email them to you...I want iphone 4 unlocked or on o2 an good condition...Let me no how much cash you want ontop and i will let you no...Need it ASAP Call or text me on 07900334459