Apple is in "something of a quiet panic" about the state of the glass on the iPhone 4, sources inside and outside of the company allege. Some time after problems with the device's antenna emerged, the engineering team is said to have identified another issue related to the rear glass. If dirt or debris gets trapped in a slide-on case covering the phone's back, this may potentially cause scratching. Whereas it would only ruin the look of an older iPhone, on the iPhone 4, the damage is thought to carry the risk of eventually cracking or outr
