iphone 3gs Black 16gb +

Hi all, I would like to swap my Iphone 3gs for the following: Iphone 4 plus cash nokia lumia710 upwards sony experia u or any other phone which you think is worth the swap. Please be realistic! Should be unlocked or on o2 Note that the Iphone is phone only and no charger or box. Slight scratches on the back but in full working order and jailbreaked. Unlocked to all networks Please text me!!