iPhone 4: A4 Chip and Gyroscope

The iPhone 4 will also feature an Apple-designed A4 CPU, following along the lines of the processor powering the iPad. Jobs said the A4 processor improved power management, so the iPhone 4 will manage 40 percent more talk time on 3G networks (up to 7 hours), or up to 6 hours of 3G Web browsing or 10 hours of Wi-Fi browsing. The device can also play up to 10 hours of video, 40 hours of music, and should have an standby time of up to 300 hours. The iPhone 4 will also pack up to 32 GB of onboard flash storage, and will offer quad-band HSDPA/HSUPA for mobile broadband speeds up to 7.2Mbps downstream, 4.8Mbps upstream…assuming carrier networks support that technology. The iPhone 4 will also support 802.11n Wi-Fi, assisted GPS, Bluetooth, and packs and accelerometer, compass, proximity sensor, and an ambient light sensor,. The iPhone 4 also sports a gyroscope, which enables six-axis motion sensing…just like a game controller, and iPhone OS 4 will offer developer APIs to leverage the gyroscope: Jobs envisions the gyroscope enabling whole new types of mobile gaming.

Video Calling

front-facing camera in the iPhone 4 exists for one and only one purpose: video calls. Jobs demonstrated what Apple is dubbing FaceTime video calling with the iPhone 4. The feature will initially be Wi-Fi only and operate iPhone 4 devices—no word in whether FaceTime will support, say, desktops or notebooks equipped with cameras. Users will be able to switch to the rear-mounted 5 megapixel camera on the iPhone 4 to let callers see what they’re seeing, or stick with the front-facing camera for face-to-face chat. Jobs says Apple plans to work with mobile operators to make FaceTime available over 3G data services. Apple says it plans to ship millions of FaceTime-capable devices this year—and if current iPhone sales are any indicator, they’re right—so iPhone 4 users will have plenty of people to talk to. (How far off is an app called FaceTime Roulette?)

iPhone 4: Retina Display

The iPhone 4 will also sport what Jobs described as a “retina display” with four times the pixel density of a typical LCD display at a whopping 326 pixels per inch—by far denser than anything else in the consumer electronics market. The result is a 3.5-inch display with a native resolution of 960 by 640 pixels that is actually a higher resolution than the typical human eye is capable of perceiving, when held at a distance of just 10 to 12 inches. Jobs claims the iPhone 4’s display winds up looking like a high quality printed book (albeit that emits light!) rather than a blocky pixellated grid. The iPhone OS automatically handles rendering text and controls at the higher resolution for the iPhone 4, so developers don’t need to do anything to update their applications to look good on the new display…but, of course, if developers want to add higher-resolution graphics to their apps, they will look stunning on the iPhone 4.