i honestly don't think you'll ever get one without those hairline cracks. if it doesn't have it at the beginning, it'll develop it over time. i went through a couple of iphones.. there was one with a hairline crack on the screen and one near the sim card slot.. went to get that one replaced, got one with hairline cracks all around the casing. had to replace that one, and got another one with a couple of hairline cracks on the casing. the geniuses eventually told me it was normal and showed me a couple of examples. sometimes you never know.. you could get one that's worse. but if it bugs you, definitely go replace it. 🙂