The new display is the same 3.5 inches diagonally, but at 960 by 640 it has four times as many pixels as the previous model. And the 800:1 contrast ratio is also four times that of the iPhone 3GS. It uses the same IPS display technology as the iPad and the iMac for good color fidelity, brightness, and viewing angle. The iPhone 4 is running a specially designed A4 processor, which gives you better performance and impressive battery life. Gamers should be excited by the inclusion of a 3-axis Gyro for rotation in 3D-space it is tied to the accelerometer and GPS for ultimate immersion in gameplay.The iPhone 4 is the first iphone to feature a flash on its camera (LED), and it also has a micro SIM slot (to save space for other essential inner workings of the handset). There is also a front-facing video camera for video calling something Apple is keen to push, with an iPhone 4 to iPhone 4 video calling app called FaceTime, which will work only over Wi-Fi.The main camera is the subject of a whole new camer system going from 3- to 5-megapixels, the camera also features a backside illuminated sensor which increases the quality of images shot in low-light. It is also significantly better for video footage, given that it is toting an HD-camera which can shoot 720p at 30fps what Apple is calling real HD.iPhone 4 will come with Apple newly re-named iPhone OS, iOS4. This will come with some much-lusted after features like multi-tasking. Some love has really gone into the secondary hardware elements; first the front-facing camera, now we see there’s also a secondary mic for noise cancellation on calls and while recording, and Apple has also deigned to split the volume keys
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