Some of the main improvements for the iPhone 4 are video calling with FaceTime capability, a high res display and HD video recording, with a 5 mega pixel camera, to name just a few.

People have been asking for video calling capabilities for a long time, and the iPhone 4 and FaceTime actually allow this to happen. You can smile and wave at your kids from across the world or share a laugh with your mates other Wi-Fi. This functionality works straight out of the box which means it is easier than ever to stay in touch with the people you care about.

Two cameras are built into the iPhone 4:  the first is located on the front, and it focuses on the phone's user, while the second one on the back captures the rest of the scene. You can use either one when you are having a video call, all at the push of a button.

The iPhone 4 screen has 4x the pixel count of previous iPhones, it is the highest resolution phone screen available. Indeed, the density of the pixels is so elevated that humans cannot discern individual pixels, resulting in astoundingly sharp text and images.

With the iPhone 4 you have a completely original method for carrying out multiple tasks at once. The third party apps that you know and love and all be run instantaneously without any slowdown or battery drainage, given the new technology inherent in the iPhone 4. Such smooth multitasking capability is only found on the iPhone.

The iPhone 4 can even record home videos in HD. Shoot astoundingly high quality videos even in poorly lit conditions, due to the iPhone's backside illumination sensor and integrated LED function. With the new iMovie app you can edit the video on the iPhone itself, thanks to the Apple designed titles, themes and transitions you can be sure of a high quality result.

Use the LED flash-capable 5 megapixel camera to take fantastic pictures that are crisp and clear. The incredible illumination sensor will allow you to take good pictures in even poor lighting conditions and the front facing camera allows you to take portrait shots.

Troy Bakers is a freelance writer who covers the cell phone industry providing resources relating to various products including iPhone Accessories and the new iPhone 4 unlocked.