The iPhone 4 is 9.3mm thick (a quarter thinner than the iPhone 3GS) with two built-in cameras (one on the front and one on the back with an LED flash), and two microphones for noise cancellation. It's powered by Apple's A4 chip, the same one that can be found inside the iPad.
It will be available June 24 in both white and black versions for $199 with 16GB of built-in storage, and $299 for the 32GB version--both with a two-year service agreement with AT&T. Apple has worked out a deal with AT&T to give iPhone owners whose current contract expires in 2010 a chance to get the device at these subsidized prices if they are willing to sign a new two-year contract (for more details on upgrade eligibility read our FAQ)
The new phone features a 940x640 pixel "Retina Display," which is four times the resolution of previous iPhone models; older apps are simply scaled up. It uses the same IPS display that's found on the iPad, and has an 800:1 contrast ratio.
The camera on the back is rated at 5 megapixels, and includes an LED flash. Besides still images (which can be shot at up to 5x digital zoom), the camera can also shoot 720p high-definition video at a constant 30 frames per second. Jobs also noted that the sensor is back-side illuminated, which keeps the wiring out of the way of the sensor.
Both the back and the front-facing camera can be used for a new video chat feature, which Jobs demonstrated live, on-stage with Apple's head designer Jonathan Ive. The app to do so is called "FaceTime" and will remain a Wi-Fi-only feature until carriers can catch up with the bandwidth needed.
Apple's FaceTime feature brings two-way videoconferencing to iPhone owners. Apple says the feature is coming to other devices in the future.
Among the other new hardware features is better battery life, which is rated at 7 hours of talk time, 6 hours of 3G Web browsing, 10 hours of Wi-Fi browsing, and 300 hours of standby time. That's up from 5 hours of 3G talk time on the previous-generation 3GS model.
Jobs also noted that the seam around the side of the phone is actually part of an antenna that wraps all the way around the device, though he did not say whether that improves cell phone or Wi-Fi reception. Other hardware changes include a new 3-axis gyroscope with pitch, roll and yaw sensors, which is separate from the iPhone's accelerometer. It provides app developers with 6-axis motion control that can be built into their apps and games.
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