In order to avoid a PR nightmare Apple has quietly started investigating reports alleging that the glass backs of iPhones are prone to cracking. Apple does use highly durable glass for the backs of its iPhones but consistent friction may cause it to shatter.
According to gdgt, Apple has tasked an engineering team to investigate widespread reports of iPhone glass backs cracking after rubbing against third party cases. Apparently, small rocks and particles can get lodged between the case and iPhone. The friction between the case and iPhone over time can cause the glass back to crack.
gdgt reports that Apple’s engineering team is in “quiet lockdown” working to resolve the problem.
The iPhone team has grown to be very concerned by this issue with slide-on cases, and has created a lab and large new test program specifically to investigate this further.
It seems like Apple just got over the whole back antenna debacle. It will be interesting to see if anything significant comes of this “lockdown.”