Everyone agrees that the iPhone 4 was Apple’s best iPhone yet on the technology side—a fast, powerful pocket computer with a good cell phone and a great cell phone-caliber camera built in. But it’s also ridiculously fragile. One year after the device’s launch, four of the five iLounge editors who purchased iPhone 4s have had to replace them due to shattered glass. Last week, our publisher became the third, and yesterday, I…