it's just a phone not a professional grade camera, don't worry about it
That's the stupidest thing I've ever read.
I had a white 4S. Light leaks though the white glass much more than the black and causes this problem.
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It's not the color of the phone.
Some of my shots are washed out, some are not- even from the same shooting sequence. This tells me that for some shots the auto mode made an aperture adjustment to compensate for the flash firing too far from the subject.
I agree it could take better photos with the flash, but look at the size and resulting distribution of the iPhone flash, then look at a point and shoot. It's a difference of magnitudes.
It IS the color of the phone. White glass lets A LOT more light bleed through and it's messing up the exposures. I replaced mine with a black phone and the issue disappeared. BTW, I went through 3 white phones and all had the exact same issue.