Cracking the Case of the Troublesome iPhone 4 Glass

Insurers and repair shops agree that iPhone 4 glass screens break more easily than iPhone 3G and 3GS screens. What gives? Find out why iPhone 4 screens are more susceptible to breakage and what you can do about it.

Wed, October 13, 2010

CIO — If your cat swats your iPhone 4 across the room, there's a good chance the iPhone will smash against a wall or the floor and, sadly, one of the glass screens will crack—at least twice the chance as with the iPhone 3GS, because the iPhone 4 is double-sided.

How delicate is the iPhone 4 glass? SquareTrade, an iPhone warranty provider, reported that iPhone 4 screens break a whopping 82 percent more than iPhone 3GS screens.

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iPhone 4 models aren't known for their overall durability: 4.7 percent of iPhone 4 owners reported damage in the first four months, compared with 2.8 percent of iPhone 3GS owners, according to SquareTrade. This has at least one tech manager worried about bringing iPhones into the enterprise.

"Drop it, and we have to buy another one at full price," Shane Allen, former information systems manager at Special Devices, a manufacturer of air-bag initiators for the automotive industry, told earlier this year. "But you can drop kick a BlackBerry or candy bar phone or flip phone."

Two-thirds of all iPhone accident claims fall into three categories—liquid damage, cracked screens and theft—says Aaron Cooper, marketing director at Worth Ave. Group, a consumer electronics insurer. "We're seeing more accidents, probably because people are more attached to their iPhones and iPads than ever before," Cooper says.

"The iPhone 4 breaks more," says Kyle Wiens, CEO of iFixit, a website that provides free repair manuals and advice forums mostly aimed at Apple (AAPL) products.

So what's behind the iPhone 4's higher risk of a cracked screen? Sure, the iPhone 4 has glass on both front and back, thus having twice as much glass as the single-sided iPhone 3GS—but there's more to it.

Perhaps the biggest reason for the iPhone 4 screen's susceptibility to breakage: The iPhone 4 glass extends to the edges of the phone. An impact on the edge, say, a fall on concrete from only a couple of feet in the air, will shatter the glass, says Wiens, because the glass directly takes the impact.

On the iPhone 3GS, though, a relatively large metal ring surrounds the edge. The metal ring is a lot more forgiving than glass and thus can better handle such an impact, Wiens says.

Apple claims iPhone 4 screens are 30 times harder than plastic and comparable to sapphire crystal, yet that's part of the problem, some Apple iPhone experts say. Hardness makes the screen more scratch resistant, but not as elastic. Given plastic's elasticity, there's less chance of the plastic shattering. "Yes, the [iPhone 4 screens] are 30 times harder and so they're going to break more," Wiens says.

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