I have gone through numerous iPhone replacements for both 3g and 3gs and with extra care and here are my findings. Tried powersupport case and the same crack appears on 3g. (3g Replaced 3x times) Upgraded to 3gs and Moved on to incase Black Matt case and the crack appears in the same spot. (Replaced under warranty) Replacement case changed to the new white incase shiny one with the expectation that the previous cases were too tight for the phone and the same crack appears. (Replaced again under warranty, got the tethered iphone but oh well) This time went caseless as I was tired of seeing the crack and guess what the SAME CRACK reappeared. Now the only constant factor here is the Bang & Olufsen Earset 3 headset that I use daily. This is a fundamental design flaw that should be addressed with apple, but given the fact that the 3g and 3gs series are towards their EOL, I doubt apple will do anything to address these issues. Even though they replace the phone under warranty, it does not warrant a company from not addressing the issue.