I just got went to the Apple store for two tiny dust specks dust under the screen of my 3GS- once you know they are there,they're hard not to notice. They said they would fix it, and it would be ready in 20 minutes. I went back to my car and was reading the work form- it said for the solution "replace display". I'm thinking "sweet, new glass with a fresh oleophobic coating, but what if they do the whole case?" I didn't get my hopes up though. But they did- they replaced all the external components- new back casing, new glass, new surrounding metal band, and possibly new buttons (they were already unblemished, so it's hard to be sure about the buttons). Bottom line, it looks like a brand new, right out of the box phone, and I didn't have to go through the hassle of doing a restore to a new phone and reconfiguring all my settings, etc., not to mention taking my chances by replacing a perfectly-working phone with something not tested and put through the paces. This is much better than a replacement for me (and most customers, I would guess), and I'm sure it must save Apple a bundle.