Man, if this happens randomly, Apple will have a huge problem on their hands. This would suck if it happened after the warranty expired and because the phone wasn't sealed well and dust got in. The quality control has seriously gotten worse. When I went to have my phone replaced because of the smudge, the first replacement had all kinds of scratches on the beveled edge. The second one had a few tiny scratches and was acceptable to me. But when I got home and took off the plastic, I noticed a sizable gouge on the front beveled edge near the lightning port. I think they use the phones that didn't pass cosmetic QC as replacements or something.