Now to the details:
In the back for instance, there's a xx gb little square which we that own an iPhone 4 that was bought from Apple or AT&T know that iPhone 4's don't even have a gb recognition square case like the previous models.
Second is the weird dotted frame which I believe is for proximity sensor, black iPhone 4 don't have it.
Third and for me the most relevant issue is the camera, when I turned the phone and saw the camera it looked like a normal camera from iPhone 4, I first took a picture without flash, worked well, then I used flash, there's where the issue was found, the picture came out like a spirit look a like object, like if the camera was a taking a picture from the flash, now maybe I found out why the white iPhone 4 was never launched for sale, and the reason is simple the camera, the white contrast with the plastic, plus the flash makes the pictures come out blurry and as I call it look a like spirit.
(pictures taking with iPhone 4)
-- Desde Mi iPhone