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Re: Dust behind lens/on sensor? Any suggestions or do I try a warranty claim?
I'd say that's indeed dust or debris on the sensor or somewhere inside the lens mechanism. If your phone is pristine and the outer lens cover (the clear plastic/glass lens covering the actual lens) is clean and scratch-free, warranty should definitely cover this issue. Besides, if the lens cover is dirty or scratched, you don't usually see such sharp-edged artifacts in photos. My old HTC phone has a very dirty lens cover (dirt inside the lens cover) and pics come out blurry and muddy but there are no black, sharp-edged artifacts in the pics.
I wouldn't tear it down any further. Just take a few shots that clearly demonstrate the problem (just like the one you posted) and show them to AT&T or Samsung service. This is exactly what the warranty is for!