My phone also has cracks. I have returned it for different reasons before, (dead pixels and light leaking). I have about a dozen cracks along the headphone jack, sim card, camera, and volume button. Other then that the phone has no dead pixels and the light doesn't leak. Do you think I should exchange it for a new one? I just hate exchanging it over and over. I have the black 16gb.
Since my last exchange I had to take back mine today for dead pixels, a messed up proximity sensor and a super loose vibrate switch( If you just touched it it would vibrate.)🙁 So in total I have 4 exchanges all came out of the original box(Not Refurbished.) The one I got today has cracks. I have learned to live with the cracks, in all reality the only person that sees them is you. I just feel like it's a 50/50 chance every time you exchange the phone there will be a defect. For me as long as the screen is good(no dust or dead pixels) and the buttons and phone work, I can live with the cracks if they are superficial. If they bother you take it back, but remember you can get one worse than the one you have. Good Luck😀