The Apple IPhone 4

The iPhone 4 is the biggest upgrade to Apple's smartphone since the iPhone 3G. It's also the showcase handset for Apple's newest operating system, iOS 4, which adds a selection of long-overdue features.

Though the iPhone 3G and the 3GS models simply tweaked the original handset's design, iPhone 4 marks a sharp departure from those previous models. Admittedly, we never had a problem with the look of the previous handsets, but we approve of the iPhone 4's changes. The front and back sides are glass, both surfaces are flat, and a stainless steel border circles the entire phone. Though it's a tad boxy, it also has a clean, svelte, and unmistakably Apple look. What's more, we love that the flat back means that the phone no longer wobbles when resting on a table. You can get the iPhone 4 in both black and white.

Despite the oleophobic coating on both the front and back sides, the glass attracts smudges by the ton.The iPhone 4 has a solid, sturdy feel, though we didn't love its sharp corners. It survived a few drops to a carpeted floor, but we wonder how it will withstand traveling in a pocket with keys and coins. Luckily, the Apple-supplied bumper will offer needed protection, even if it takes away from the handset's sleek profile.

At 4.5 inches tall by 2.3 inches wide by 0.37 inch deep, the iPhone 4 is as tall as the iPhone 3GS, but slightly thinner--25 percent, to be exact--and narrow when measured across its front face. It does feel smaller when compared with its predecessors. It weighs about 4.8 ounces, which is back to what we had with the first iPhone (both the 3G and 3GS models were slightly lighter).

The remaining exterior elements are largely unchanged. The Home button is in its normal place below the display; the 3.5mm headset jack and power key sit up top next to the aforementioned noise-cancellation microphone; and the 30-pin connector, microphone, and speaker are where they belong on the iPhone 4's bottom end. Unfortunately, and to no one's surprise, you still can't remove the battery.