iphone 4 black unlocked or swap with iphone 4 white .

hi i have a iphone 4 black unlocked mint condition no scratches back and front but vibration(side button) sometime work sometime not work but i have download app wich is u can use as a vibration button iam selling because i want iphone 4 white unlocked i want to swap with iphone 4 white as well comes with charger only