iPhone 4 black 16gb - unlocked - swap for another phone ?

Hii have an iPhone 4 in black 16gb. Factory unlocked Fancy a change so am looking to swap for another phone, preferably an android one (similar value obviously) iPhone is in pretty good condition with just a couple of small dinks, home button sticks occasionally but not an issue Swap needs to be made in or around Harlow Essex Email me your offers for quick response