Apple has introduced technology called Retina display which it says has four times the pixel count of existing iPhones. Apple claims the resolution is so clear that the human eye will be unable to distinguish individual pixels, making text crisp and images appear sharp.
FaceTime is a new app which lets iPhone users make video calls. The iPhone 4 has two cameras, and either can be used for video calls.
Apple has also included a built-in three-axis gyroscope. When paired with the iPhone's accelerometer, it makes iPhone 4 capable of motion sensing such as user acceleration, angular velocity, and rotation rate. Apple says this allows the iPhone 4 to offer motion gestures and greater precision for games playing.
This article was first published by Computer Weekly