Though the iPhone 4S might not be the most exciting iPhone to appear, an improved camera, a faster processor, and the addition of the Siri personal assistant make it a powerful smartphone. If you are upgrading from a 3G or a 3GS, you’ll see a huge difference. But if you have an iPhone 4, you may want to wait for the next upgrade. The phone’s iOS still has a few irksome shortcomings, and I wasn’t thrilled by the call quality (but I also found no an--tenna issues); otherwise, the iPhone 4S impresses. The iPhone 4S is largely identical in design to the iPhone 4, and it exudes elegance. Fingerprints on its glass were less of an issue than on the iPhone 4. The phone’s “Retina display”—so named because it surpasses the number of pixels that the human retina can process—greatly improves the sharpness, clarity, and visible detail of images. The display fades in bright sunlight, however. In general I was disappointed by this phone’s lack of innovation. Android has long had features like tabbed browsing. Still, iOS 5 works well, runs smoothly, and is a strong version upgrade overall. You can finally update your iPhone over the cloud, with no need to connect it to your PC. Also, the notifications feature is more capable. Mail adds formatting and a built-in dictionary. The iMessage app lets you send messages to any iOS device, regardless of whether it has SMS support. Apple says that the iPhone 4S camera has 60 percent more pixels than the iPhone 4 camera (8 megapixels versus 5 megapixels); that doesn’t translate directly into improved image quality, but it does mean that you’ll be able to print out images at a bigger size without losing resolution. We ran head-to-head subjective lab tests of the iPhone 4S’s camera versus the cameras on a bunch of Android phones and an older iPhone 4, and (as a control) a stand-alone digital camera. The iPhone 4S ranked third in image quality in our tests, below the undefeated MyTouch 4G Slide and the second-place Samsung Galaxy S II. You can see the full results of our tests here. In my own casual hands-on testing, I found the iPhone 4S’s 8-megapixel camera to be a huge im--provement over the iPhone 4’s, overall. Data speeds for the iPhone 4S in my tests were disappointing, however—I averaged 0.38 megabit per second for downloads and 0.21 mbps for up--loads. But at last the iPhone has gone dual-core. Dual-core doesn’t necessarily mean that you’ll get double your previous speed, but you’ll be able to see the difference in video, gaming, and Web browsing.
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